Update rubocop-packaging requirement from 0.5.2 to 0.6.0 (#491)

Updates the requirements on
[rubocop-packaging](https://github.com/utkarsh2102/rubocop-packaging) to
permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/utkarsh2102/rubocop-packaging/releases">rubocop-packaging's
releases</a>.</em></p>
<blockquote>
<h2>v0.6.0</h2>
<p>A new and shiny release with bug fixes and enabling the RuboCop's
plugin system! 🎉</p>
<p>Shoutout to <a href="https://github.com/koic"><code>@​koic</code></a>
and <a href="https://github.com/mvz"><code>@​mvz</code></a> for their
help as always! 💛</p>
<h3>Enabling RuboCop's plugin system! 🍾</h3>
<ul>
<li><a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/53">#53</a>:
Pluginfy rubocop-packaging. (<a
href="https://github.com/koic"><code>@​koic</code></a>)</li>
</ul>
<h3>Fixes</h3>
<ul>
<li><a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/47">#47</a>:
Fix incorrect documentation URLs when using <code>rubocop
--show-docs-url</code>. (<a
href="https://github.com/r7kamura"><code>@​r7kamura</code></a>)</li>
<li><a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/48">#48</a>:
Rename IgnoredMethods to AllowedMethods. (<a
href="https://github.com/micwoj92"><code>@​micwoj92</code></a>)</li>
<li><a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/49">#49</a>:
Fix spec failures for the GemspecGit cop. (<a
href="https://github.com/mvz"><code>@​mvz</code></a>)</li>
</ul>
<h3>Changes</h3>
<ul>
<li><a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/50">#50</a>:
Replace soft-deprecated runtime dependency specification. (<a
href="https://github.com/mvz"><code>@​mvz</code></a>)</li>
<li><a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/51">#51</a>:
Remove dependency on pry. (<a
href="https://github.com/mvz"><code>@​mvz</code></a>)</li>
<li><a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/52">#52</a>:
Suppress a RuboCop's offense. (<a
href="https://github.com/koic"><code>@​koic</code></a>)</li>
<li><a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/54">#54</a>:
Drop .travis.yml in favor of GitHub actions. (<a
href="https://github.com/utkarsh2102"><code>@​utkarsh2102</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/277bcfead602e59c3a89dca346c7ab58eeeb18ad"><code>277bcfe</code></a>
Cut 0.6.0 release</li>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/035bbd3c7cf03a33bbc4c731e3eb61ff4940bafa"><code>035bbd3</code></a>
Drop .travis.yml in favor of GitHub actions</li>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/1aedbcd9fc9fbae746f972ba6227f360d7381d0c"><code>1aedbcd</code></a>
Merge pull request <a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/52">#52</a>
from koic/suppress_rubocop_offense</li>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/7e79d6b4f0297cbb825a26de8a9e6486860c68d0"><code>7e79d6b</code></a>
Merge pull request <a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/53">#53</a>
from koic/pluginfy_with_lint_roller</li>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/0db162eb3ef5a53cf41461555160f34026746587"><code>0db162e</code></a>
Pluginfy rubocop-packaging</li>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/e1b60d0bb0de682d6fbca15f4b37e7fa930cd0ba"><code>e1b60d0</code></a>
Suppress a RuboCop's offense</li>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/783cefa3795ac58fe2ae74a94032355593204600"><code>783cefa</code></a>
Merge pull request <a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/51">#51</a>
from utkarsh2102/remove-pry-dependency</li>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/dd62d9867cf0262fb62df30af928efecd7df9e3f"><code>dd62d98</code></a>
Remove dependency on pry</li>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/a566b5087932194b3f5a044dd496c976bdcb2bed"><code>a566b50</code></a>
Merge pull request <a
href="https://redirect.github.com/utkarsh2102/rubocop-packaging/issues/50">#50</a>
from utkarsh2102/update-gemspec-runtime-dependencies</li>
<li><a
href="https://github.com/utkarsh2102/rubocop-packaging/commit/1e0cd539e1015034cbf3095aa997fc11d628c102"><code>1e0cd53</code></a>
Replace soft-deprecated runtime dependency specification</li>
<li>Additional commits viewable in <a
href="https://github.com/utkarsh2102/rubocop-packaging/compare/v0.5.2...v0.6.0">compare
view</a></li>
</ul>
</details>
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Gemfile

@@ -10,6 +10,6 @@ gem "rake", "~> 13.0"
 gem "rubocop", "1.75.4"
 gem "rubocop-md", "1.2.4"
 gem "rubocop-minitest", "0.38.0"
-gem "rubocop-packaging", "0.5.2"
+gem "rubocop-packaging", "0.6.0"
 gem "rubocop-performance", "1.25.0"
 gem "rubocop-rake", "0.7.1"