Update mighty_test requirement from ~> 0.2.0 to ~> 0.3.0 (#449)

Updates the requirements on
[mighty_test](https://github.com/mattbrictson/mighty_test) to permit the
latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/mattbrictson/mighty_test/releases">mighty_test's
releases</a>.</em></p>
<blockquote>
<h2>0.3.0</h2>
<h2>✨ New Features</h2>
<ul>
<li>Support <code>-w</code> flag to enable Ruby warnings (<a
href="https://redirect.github.com/mattbrictson/mighty_test/issues/32">#32</a>)
<a
href="https://github.com/mattbrictson"><code>@​mattbrictson</code></a></li>
</ul>
<h2>🐛 Bug Fixes</h2>
<ul>
<li>Fix &quot;circular require&quot; Ruby warning (<a
href="https://redirect.github.com/mattbrictson/mighty_test/issues/31">#31</a>)
<a
href="https://github.com/mattbrictson"><code>@​mattbrictson</code></a></li>
</ul>
<h2>🏠 Housekeeping</h2>
<ul>
<li>Update rubocop requirement from 1.62.1 to 1.63.4 (<a
href="https://redirect.github.com/mattbrictson/mighty_test/issues/33">#33</a>)
<a
href="https://github.com/dependabot"><code>@​dependabot</code></a></li>
</ul>
<p><strong>Full Changelog:</strong> <a
href="https://github.com/mattbrictson/mighty_test/compare/v0.2.0...v0.3.0">https://github.com/mattbrictson/mighty_test/compare/v0.2.0...v0.3.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/mattbrictson/mighty_test/commit/9326d846da4c8165aecf79206e7190d872f8cf3c"><code>9326d84</code></a>
Release 0.3.0</li>
<li><a
href="https://github.com/mattbrictson/mighty_test/commit/a53420dffb5c64c6bb924d09ab9bb5ebfe033afa"><code>a53420d</code></a>
Update rubocop requirement from 1.62.1 to 1.63.4 (<a
href="https://redirect.github.com/mattbrictson/mighty_test/issues/33">#33</a>)</li>
<li><a
href="https://github.com/mattbrictson/mighty_test/commit/6a694ef05354608c0bebf20e758b5b426fa7a902"><code>6a694ef</code></a>
Support <code>-w</code> flag to enable Ruby warnings (<a
href="https://redirect.github.com/mattbrictson/mighty_test/issues/32">#32</a>)</li>
<li><a
href="https://github.com/mattbrictson/mighty_test/commit/4342efa4c61722828c3f3cbe76d865a3328e50d6"><code>4342efa</code></a>
Fix &quot;circular require&quot; Ruby warning (<a
href="https://redirect.github.com/mattbrictson/mighty_test/issues/31">#31</a>)</li>
<li>See full diff in <a
href="https://github.com/mattbrictson/mighty_test/compare/v0.2.0...v0.3.0">compare
view</a></li>
</ul>
</details>
<br />


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Gemfile

@@ -2,7 +2,7 @@ source "https://rubygems.org"
 gemspec
 
 gem "concurrent-ruby", "~> 1.1"
-gem "mighty_test", "~> 0.2.0" unless RUBY_VERSION < "3.1"
+gem "mighty_test", "~> 0.3.0" unless RUBY_VERSION < "3.1"
 gem "minitest", "~> 5.11"
 gem "rake", "~> 13.0"
 gem "rubocop", "1.64.0"