Bump importmap-rails from 2.0.3 to 2.1.0 (#4180)

Bumps [importmap-rails](https://github.com/rails/importmap-rails) from
2.0.3 to 2.1.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/rails/importmap-rails/releases">importmap-rails's
releases</a>.</em></p>
<blockquote>
<h2>v2.1.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Adds <code>bin/importmap pristine</code> which redownloads pinned
packages by <a
href="https://github.com/martinemde"><code>@​martinemde</code></a> in <a
href="https://redirect.github.com/rails/importmap-rails/pull/271">rails/importmap-rails#271</a></li>
<li>Encapsulate stale_when_importmap_changes method by <a
href="https://github.com/dhh"><code>@​dhh</code></a> in <a
href="https://redirect.github.com/rails/importmap-rails/pull/284">rails/importmap-rails#284</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a
href="https://github.com/martinemde"><code>@​martinemde</code></a> made
their first contribution in <a
href="https://redirect.github.com/rails/importmap-rails/pull/271">rails/importmap-rails#271</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/rails/importmap-rails/compare/v2.0.3...v2.1.0">https://github.com/rails/importmap-rails/compare/v2.0.3...v2.1.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rails/importmap-rails/commit/d91d5e134d3f27e2332a8cb2ac015ea03d130621"><code>d91d5e1</code></a>
Bump version for 2.1.0</li>
<li><a
href="https://github.com/rails/importmap-rails/commit/2ef81f06dcce46e83ecb068bfc3f5399b34e044a"><code>2ef81f0</code></a>
Encapsulate stale_when_importmap_changes method (<a
href="https://redirect.github.com/rails/importmap-rails/issues/284">#284</a>)</li>
<li><a
href="https://github.com/rails/importmap-rails/commit/f588506eebc7b276f8b3539301633f93d2bda55d"><code>f588506</code></a>
Correct pristine command description and args (<a
href="https://redirect.github.com/rails/importmap-rails/issues/272">#272</a>)</li>
<li><a
href="https://github.com/rails/importmap-rails/commit/f273945a68fb9abe0fc42c17b7da550208cbd06a"><code>f273945</code></a>
Adds <code>bin/importmap pristine</code> which redownloads pinned
packages (<a
href="https://redirect.github.com/rails/importmap-rails/issues/271">#271</a>)</li>
<li><a
href="https://github.com/rails/importmap-rails/commit/abba7c874d6851a6d5ef5a2a66f1cb19ab61de03"><code>abba7c8</code></a>
Revert &quot;Re-enable support for Ruby 2.7&quot;</li>
<li>See full diff in <a
href="https://github.com/rails/importmap-rails/compare/v2.0.3...v2.1.0">compare
view</a></li>
</ul>
</details>
<br />


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Gemfile.lock

@@ -197,7 +197,7 @@ GEM
     image_processing (1.13.0)
       mini_magick (>= 4.9.5, < 5)
       ruby-vips (>= 2.0.17, < 3)
-    importmap-rails (2.0.3)
+    importmap-rails (2.1.0)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)