Upgrade: Bump propshaft from 0.9.0 to 0.9.1 (#4775)

Bumps [propshaft](https://github.com/rails/propshaft) from 0.9.0 to
0.9.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/rails/propshaft/releases">propshaft's
releases</a>.</em></p>
<blockquote>
<h2>v0.9.1</h2>
<h2>What's Changed</h2>
<ul>
<li>Fix 404 for loading source maps with digests in url by <a
href="https://github.com/theodorton"><code>@​theodorton</code></a> in <a
href="https://redirect.github.com/rails/propshaft/pull/194">rails/propshaft#194</a></li>
<li>Require active_support's delegation module (fix crash introduced in
0.9.0) by <a
href="https://github.com/aaronjensen"><code>@​aaronjensen</code></a> in
<a
href="https://redirect.github.com/rails/propshaft/pull/191">rails/propshaft#191</a></li>
<li>Fix deprecation in engine mounting by <a
href="https://github.com/atomaka"><code>@​atomaka</code></a> in <a
href="https://redirect.github.com/rails/propshaft/pull/198">rails/propshaft#198</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/atomaka"><code>@​atomaka</code></a> made
their first contribution in <a
href="https://redirect.github.com/rails/propshaft/pull/198">rails/propshaft#198</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/rails/propshaft/compare/v0.9.0...v0.9.1">https://github.com/rails/propshaft/compare/v0.9.0...v0.9.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rails/propshaft/commit/2abf5421e065a3c9fead1119668af5fa2bbec1bb"><code>2abf542</code></a>
Bump version for 0.9.1</li>
<li><a
href="https://github.com/rails/propshaft/commit/40b578cc8741b08f718600777d1099ebd78456f6"><code>40b578c</code></a>
Fix deprecation in engine mounting (<a
href="https://redirect.github.com/rails/propshaft/issues/198">#198</a>)</li>
<li><a
href="https://github.com/rails/propshaft/commit/af557fbd10dc9856c943b3324f340a87295f5041"><code>af557fb</code></a>
Make digest regex less strict on .map extensions (<a
href="https://redirect.github.com/rails/propshaft/issues/194">#194</a>)</li>
<li><a
href="https://github.com/rails/propshaft/commit/c14f2b4454d729e64b439c6a49592f6c090c59a6"><code>c14f2b4</code></a>
Require active_support's delegation module (<a
href="https://redirect.github.com/rails/propshaft/issues/191">#191</a>)</li>
<li>See full diff in <a
href="https://github.com/rails/propshaft/compare/v0.9.0...v0.9.1">compare
view</a></li>
</ul>
</details>
<br />


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</details>

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Gemfile.lock

@@ -351,7 +351,7 @@ GEM
       ast (~> 2.4.1)
       racc
     pg (1.5.7)
-    propshaft (0.9.0)
+    propshaft (0.9.1)
       actionpack (>= 7.0.0)
       activesupport (>= 7.0.0)
       rack