Bump rdoc from 6.8.1 to 6.9.0 (#1085)

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.8.1 to 6.9.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/ruby/rdoc/releases">rdoc's
releases</a>.</em></p>
<blockquote>
<h2>v6.9.0</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<h3>✨ Enhancements</h3>
<ul>
<li>Deprecate <code>main</code> and <code>title</code> directives by <a
href="https://github.com/st0012"><code>@​st0012</code></a> in <a
href="https://redirect.github.com/ruby/rdoc/pull/1218">ruby/rdoc#1218</a></li>
<li>Expand rdoc-ref targets at the end of ri output by <a
href="https://github.com/st0012"><code>@​st0012</code></a> in <a
href="https://redirect.github.com/ruby/rdoc/pull/1141">ruby/rdoc#1141</a></li>
</ul>
<h3>🐛 Bug Fixes</h3>
<ul>
<li>Improve how gemspec's files are defined by <a
href="https://github.com/st0012"><code>@​st0012</code></a> in <a
href="https://redirect.github.com/ruby/rdoc/pull/1212">ruby/rdoc#1212</a></li>
<li>fix: C variables should never show up in Ancestors tree by <a
href="https://github.com/flavorjones"><code>@​flavorjones</code></a> in
<a
href="https://redirect.github.com/ruby/rdoc/pull/1217">ruby/rdoc#1217</a></li>
<li>Sort <code>MethodAttr</code> so that names starting with symbols are
before names starting with alpha ASCII by <a
href="https://github.com/flavorjones"><code>@​flavorjones</code></a> in
<a
href="https://redirect.github.com/ruby/rdoc/pull/1219">ruby/rdoc#1219</a></li>
<li><code>ClassModule#superclass=</code> accepts a
<code>ClassModule</code> as an argument by <a
href="https://github.com/flavorjones"><code>@​flavorjones</code></a> in
<a
href="https://redirect.github.com/ruby/rdoc/pull/1222">ruby/rdoc#1222</a></li>
<li>Use distinct styles for note lists and label lists by <a
href="https://github.com/nevans"><code>@​nevans</code></a> in <a
href="https://redirect.github.com/ruby/rdoc/pull/1209">ruby/rdoc#1209</a></li>
</ul>
<h3>🛠 Other Changes</h3>
<ul>
<li>Bump step-security/harden-runner from 2.10.1 to 2.10.2 by <a
href="https://github.com/dependabot"><code>@​dependabot</code></a> in <a
href="https://redirect.github.com/ruby/rdoc/pull/1215">ruby/rdoc#1215</a></li>
<li>Bump rubygems/release-gem from
612653d273a73bdae1df8453e090060bb4db5f31 to
9e85cb11501bebc2ae661c1500176316d3987059 by <a
href="https://github.com/dependabot"><code>@​dependabot</code></a> in <a
href="https://redirect.github.com/ruby/rdoc/pull/1214">ruby/rdoc#1214</a></li>
<li>Fixed version number of rubygems/release-gem by <a
href="https://github.com/hsbt"><code>@​hsbt</code></a> in <a
href="https://redirect.github.com/ruby/rdoc/pull/1216">ruby/rdoc#1216</a></li>
<li>Prefer <code>String#ord</code> to <code>String#codepoints[0]</code>
by <a
href="https://github.com/flavorjones"><code>@​flavorjones</code></a> in
<a
href="https://redirect.github.com/ruby/rdoc/pull/1220">ruby/rdoc#1220</a></li>
<li>Workaround JRuby's jar-dependencies error and test failures on CI by
<a href="https://github.com/st0012"><code>@​st0012</code></a> in <a
href="https://redirect.github.com/ruby/rdoc/pull/1225">ruby/rdoc#1225</a></li>
<li>lint: Remove unreachable code by <a
href="https://github.com/okuramasafumi"><code>@​okuramasafumi</code></a>
in <a
href="https://redirect.github.com/ruby/rdoc/pull/1137">ruby/rdoc#1137</a></li>
<li>Stop running CI against JRuby and some CI config cleanup by <a
href="https://github.com/st0012"><code>@​st0012</code></a> in <a
href="https://redirect.github.com/ruby/rdoc/pull/1228">ruby/rdoc#1228</a></li>
<li>Make it loose coupling between RubyGems and RDoc by <a
href="https://github.com/mterada1228"><code>@​mterada1228</code></a> in
<a
href="https://redirect.github.com/ruby/rdoc/pull/1171">ruby/rdoc#1171</a></li>
<li>Fixed compatibility error with setup command and rdoc plugin on
rubygems by <a href="https://github.com/hsbt"><code>@​hsbt</code></a> in
<a
href="https://redirect.github.com/ruby/rdoc/pull/1234">ruby/rdoc#1234</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/rdoc/compare/v6.8.1...v6.9.0">https://github.com/ruby/rdoc/compare/v6.8.1...v6.9.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ruby/rdoc/commit/dba9474732cdf63be759a2801d918cb1fc88edee"><code>dba9474</code></a>
Bump version to v6.9.0</li>
<li><a
href="https://github.com/ruby/rdoc/commit/4cd5047468007e599ca6ced87f537811d653e21d"><code>4cd5047</code></a>
Fixed compatibility error with setup command and rdoc plugin on
rubygems</li>
<li><a
href="https://github.com/ruby/rdoc/commit/f4e10f4f45389667a2c39ceaf53fd8d3b2b81476"><code>f4e10f4</code></a>
Make it loose coupling between RubyGems and RDoc (<a
href="https://redirect.github.com/ruby/rdoc/issues/1171">#1171</a>)</li>
<li><a
href="https://github.com/ruby/rdoc/commit/9e2b28c6e3306ca33ae3d75dce68be5dc1296362"><code>9e2b28c</code></a>
Expand rdoc-ref targets at the end of ri output (<a
href="https://redirect.github.com/ruby/rdoc/issues/1141">#1141</a>)</li>
<li><a
href="https://github.com/ruby/rdoc/commit/4004dffc20f40ab7c8bc73607a425b900ea0d72d"><code>4004dff</code></a>
Stop running CI against JRuby and some CI config cleanup (<a
href="https://redirect.github.com/ruby/rdoc/issues/1228">#1228</a>)</li>
<li><a
href="https://github.com/ruby/rdoc/commit/a53287fce0a90fd307633328d38960736b41cb4c"><code>a53287f</code></a>
lint: Remove unreachable code (<a
href="https://redirect.github.com/ruby/rdoc/issues/1137">#1137</a>)</li>
<li><a
href="https://github.com/ruby/rdoc/commit/9e69ea6d75548d6990a4db3ddbc6665608f8f8bb"><code>9e69ea6</code></a>
Use distinct styles for note lists and label lists (<a
href="https://redirect.github.com/ruby/rdoc/issues/1209">#1209</a>)</li>
<li><a
href="https://github.com/ruby/rdoc/commit/3f9897d64c2098ab335f8f0b1b9073dc3f05ff1b"><code>3f9897d</code></a>
Workaround JRuby's jar-dependencies error and test failures on CI (<a
href="https://redirect.github.com/ruby/rdoc/issues/1225">#1225</a>)</li>
<li><a
href="https://github.com/ruby/rdoc/commit/e2d4ac9dadfe891810189628a2568ede9c190367"><code>e2d4ac9</code></a>
Deprecate <code>main</code> and <code>title</code> directives (<a
href="https://redirect.github.com/ruby/rdoc/issues/1218">#1218</a>)</li>
<li><a
href="https://github.com/ruby/rdoc/commit/09d7f35420d38b1c59d1f122d559efc6b5d2d888"><code>09d7f35</code></a>
Prefer String#ord to #codepoints[0] (<a
href="https://redirect.github.com/ruby/rdoc/issues/1220">#1220</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/ruby/rdoc/compare/v6.8.1...v6.9.0">compare
view</a></li>
</ul>
</details>
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Gemfile.lock

@@ -104,7 +104,7 @@ GEM
       thor (~> 1.0, >= 1.2.2)
       zeitwerk (~> 2.6)
     rake (13.2.1)
-    rdoc (6.8.1)
+    rdoc (6.9.0)
       psych (>= 4.0.0)
     reline (0.5.12)
       io-console (~> 0.5)