Bump net-imap from 0.5.3 to 0.5.4 in /spec/tester_mongo (#1107)

Bumps [net-imap](https://github.com/ruby/net-imap) from 0.5.3 to 0.5.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/ruby/net-imap/releases">net-imap's
releases</a>.</em></p>
<blockquote>
<h2>v0.5.4</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<h3>Added</h3>
<ul>
<li>✨ Add support for <code>PARTIAL</code> extension (RFC9394) by <a
href="https://github.com/nevans"><code>@​nevans</code></a> in <a
href="https://redirect.github.com/ruby/net-imap/pull/367">ruby/net-imap#367</a></li>
</ul>
<h3>Fixed</h3>
<ul>
<li>🐛 Fix partial-range encoding of exclusive ranges by <a
href="https://github.com/nevans"><code>@​nevans</code></a> in <a
href="https://redirect.github.com/ruby/net-imap/pull/370">ruby/net-imap#370</a></li>
</ul>
<h3>Documentation</h3>
<ul>
<li>📚 Fix documentation for <code>#fetch</code> by <a
href="https://github.com/nevans"><code>@​nevans</code></a> in <a
href="https://redirect.github.com/ruby/net-imap/pull/369">ruby/net-imap#369</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/net-imap/compare/v0.5.3...v0.5.4">https://github.com/ruby/net-imap/compare/v0.5.3...v0.5.4</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ruby/net-imap/commit/45c66281daaded06e2b45c471a9559d4c53aac66"><code>45c6628</code></a>
🔖 Bump version to 0.5.4</li>
<li><a
href="https://github.com/ruby/net-imap/commit/4648a06e9189fda0b28204e128be5db77673d234"><code>4648a06</code></a>
🔀 Merge pull request <a
href="https://redirect.github.com/ruby/net-imap/issues/367">#367</a>
from ruby/RFC9394-PARTIAL</li>
<li><a
href="https://github.com/ruby/net-imap/commit/39a646d92b6f918adaee629979f8aec51595c3c2"><code>39a646d</code></a>
📚 Document support for the <code>PARTIAL</code> extension</li>
<li><a
href="https://github.com/ruby/net-imap/commit/92557578be529362ff5444cd109061a276b9326c"><code>9255757</code></a>
✨ Add <code>partial</code> fetch modifier to uid_fetch</li>
<li><a
href="https://github.com/ruby/net-imap/commit/fa4502dfde9daf079a7f4f38be213f481b4a24ee"><code>fa4502d</code></a>
✨ Add support for <code>PARTIAL</code> esearch result</li>
<li><a
href="https://github.com/ruby/net-imap/commit/63e9e493368db383a5e0730646609fbe16ef2935"><code>63e9e49</code></a>
📚 Update <code>#search</code> rdoc (again!)</li>
<li><a
href="https://github.com/ruby/net-imap/commit/43f531ecbab8d72e8fe92dd61999df7fd7fa8423"><code>43f531e</code></a>
🐛 Fix partial-range encoding of exclusive ranges</li>
<li><a
href="https://github.com/ruby/net-imap/commit/157b52878e9c4594db4226af92a651782c40981e"><code>157b528</code></a>
📚 Fix documentation for <code>#fetch</code></li>
<li>See full diff in <a
href="https://github.com/ruby/net-imap/compare/v0.5.3...v0.5.4">compare
view</a></li>
</ul>
</details>
<br />


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spec/tester_mongo/Gemfile.lock

@@ -140,7 +140,7 @@ GEM
       mongo (>= 2.18.0, < 3.0.0)
     msgpack (1.7.5)
     mutex_m (0.3.0)
-    net-imap (0.5.3)
+    net-imap (0.5.4)
       date
       net-protocol
     net-pop (0.1.2)