Bump importmap-rails from 2.0.2 to 2.0.3 (#667)

Bumps [importmap-rails](https://github.com/rails/importmap-rails) from
2.0.2 to 2.0.3.
<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>v2.0.3</h2>
<h2>What's Changed</h2>
<ul>
<li>Fix compatibility with older Ruby versions <a
href="https://github.com/jhawthorn"><code>@​jhawthorn</code></a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/rails/importmap-rails/compare/v2.0.2...v2.0.3">https://github.com/rails/importmap-rails/compare/v2.0.2...v2.0.3</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rails/importmap-rails/commit/2927df546736437956a5d46dc6f2849353835a89"><code>2927df5</code></a>
Version 2.0.3</li>
<li><a
href="https://github.com/rails/importmap-rails/commit/32d9911c9150f15f2456dd5b5ff779d14ab6244e"><code>32d9911</code></a>
Re-enable support for Ruby 2.7</li>
<li><a
href="https://github.com/rails/importmap-rails/commit/022433ee51a08f7f1a6fa0d80099f52bd72d1584"><code>022433e</code></a>
Merge pull request <a
href="https://redirect.github.com/rails/importmap-rails/issues/267">#267</a>
from byroot/fix-ci-matrix</li>
<li><a
href="https://github.com/rails/importmap-rails/commit/ea5f28296a0d4392c569fd45f7b74241c5c90a63"><code>ea5f282</code></a>
Update CI matrix</li>
<li><a
href="https://github.com/rails/importmap-rails/commit/d79dfbf25cba37287c1d119179801bdb787d5160"><code>d79dfbf</code></a>
Bump required ruby version to 3.1</li>
<li>See full diff in <a
href="https://github.com/rails/importmap-rails/compare/v2.0.2...v2.0.3">compare
view</a></li>
</ul>
</details>
<br />


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</details>

Author: rsmithlal

Gemfile.lock

@@ -345,7 +345,7 @@ GEM
     image_processing (1.13.0)
       mini_magick (>= 4.9.5, < 5)
       ruby-vips (>= 2.0.17, < 3)
-    importmap-rails (2.0.2)
+    importmap-rails (2.0.3)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)