Bump mutex_m from 0.1.2 to 0.2.0 in /spec/tester_mongo (#319)

Bumps [mutex_m](https://github.com/ruby/mutex_m) from 0.1.2 to 0.2.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/ruby/mutex_m/releases">mutex_m's
releases</a>.</em></p>
<blockquote>
<h2>v0.2.0</h2>
<h2>What's Changed</h2>
<ul>
<li>README: use a require sans &quot;.rb&quot; by <a
href="https://github.com/olleolleolle"><code>@​olleolleolle</code></a>
in <a
href="https://redirect.github.com/ruby/mutex_m/pull/10">ruby/mutex_m#10</a></li>
<li>Drop to support Ruby 2.4 by <a
href="https://github.com/hsbt"><code>@​hsbt</code></a> in <a
href="https://redirect.github.com/ruby/mutex_m/pull/12">ruby/mutex_m#12</a></li>
<li>Avoid anonymous eval by <a
href="https://github.com/casperisfine"><code>@​casperisfine</code></a>
in <a
href="https://redirect.github.com/ruby/mutex_m/pull/11">ruby/mutex_m#11</a></li>
<li>Use reusing workflow by <a
href="https://github.com/hsbt"><code>@​hsbt</code></a> in <a
href="https://redirect.github.com/ruby/mutex_m/pull/13">ruby/mutex_m#13</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a
href="https://github.com/casperisfine"><code>@​casperisfine</code></a>
made their first contribution in <a
href="https://redirect.github.com/ruby/mutex_m/pull/11">ruby/mutex_m#11</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/ruby/mutex_m/compare/v0.1.2...v0.2.0">https://github.com/ruby/mutex_m/compare/v0.1.2...v0.2.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ruby/mutex_m/commit/635da25a095ea9f4595ca5fbe92344024d74db30"><code>635da25</code></a>
Bump up 0.2.0</li>
<li><a
href="https://github.com/ruby/mutex_m/commit/4c0b2bb040370ee422f8463d7145bc9501ef488b"><code>4c0b2bb</code></a>
Merge pull request <a
href="https://redirect.github.com/ruby/mutex_m/issues/14">#14</a> from
ruby/dependabot/github_actions/actions/checkout-4</li>
<li><a
href="https://github.com/ruby/mutex_m/commit/55ecdaf695f59e2c8f92f3e013806c9883fa4866"><code>55ecdaf</code></a>
Bump actions/checkout from 3 to 4</li>
<li><a
href="https://github.com/ruby/mutex_m/commit/3d40469c0f9dc12e5097a3994a98db8e804c004e"><code>3d40469</code></a>
Merge pull request <a
href="https://redirect.github.com/ruby/mutex_m/issues/13">#13</a> from
ruby/use-reusable-workflow</li>
<li><a
href="https://github.com/ruby/mutex_m/commit/de473606d2570daad72bab82ebc837983615669a"><code>de47360</code></a>
Use reusing workflow</li>
<li><a
href="https://github.com/ruby/mutex_m/commit/661130a95d5b11a37733e4d49db0fd6ec2606940"><code>661130a</code></a>
Merge pull request <a
href="https://redirect.github.com/ruby/mutex_m/issues/11">#11</a> from
casperisfine/avoid-anonymous-eval</li>
<li><a
href="https://github.com/ruby/mutex_m/commit/8760ab19ec17ef80a76a580c36d94a165d8f13c7"><code>8760ab1</code></a>
Avoid anonymous eval</li>
<li><a
href="https://github.com/ruby/mutex_m/commit/99f0b161c524faca6abe4e0b9a693b78e9e329d5"><code>99f0b16</code></a>
Merge pull request <a
href="https://redirect.github.com/ruby/mutex_m/issues/12">#12</a> from
ruby/drop-to-support-old-ruby</li>
<li><a
href="https://github.com/ruby/mutex_m/commit/9245b9a63aed8ede56da9f4e182c4e83f013fe2f"><code>9245b9a</code></a>
Drop to support Ruby 2.4</li>
<li><a
href="https://github.com/ruby/mutex_m/commit/f07c6b6fef55e361bcf367253d219587a22a6e58"><code>f07c6b6</code></a>
Merge pull request <a
href="https://redirect.github.com/ruby/mutex_m/issues/10">#10</a> from
ruby/docs-readme-regular-require</li>
<li>Additional commits viewable in <a
href="https://github.com/ruby/mutex_m/compare/v0.1.2...v0.2.0">compare
view</a></li>
</ul>
</details>
<br />


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spec/tester_mongo/Gemfile.lock

@@ -134,7 +134,7 @@ GEM
       mongo (>= 2.18.0, < 3.0.0)
       ruby2_keywords (~> 0.0.5)
     msgpack (1.7.2)
-    mutex_m (0.1.2)
+    mutex_m (0.2.0)
     net-imap (0.4.4)
       date
       net-protocol