Bump path from 1.9.0 to 1.9.1 in /test_utilities (#3975)

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Bumps [path](https://github.com/dart-lang/core/tree/main/pkgs) from 1.9.0 to 1.9.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dart-lang/core/releases">path's releases</a>.</em></p>
<blockquote>
<h2>package:path v1.9.1</h2>
<ul>
<li>Require Dart 3.4</li>
<li>Move to <code>dart-lang/core</code> monorepo.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/dart-lang/core/commit/ad17462bba6d6f0bb7a1c0437147ef18a6b78d7a"><code>ad17462</code></a> Merge branch 'main' into merge-path-package</li>
<li><a href="https://github.com/dart-lang/core/commit/64a2a5dd5c02058c683441181e7f17fd446aa6a5"><code>64a2a5d</code></a> Merge branch 'main' into merge-os_detect-package</li>
<li><a href="https://github.com/dart-lang/core/commit/8151b9f57fa3fee10421a19ce24470e143c0dee5"><code>8151b9f</code></a> Merge pull request <a href="https://github.com/dart-lang/core/tree/main/pkgs/issues/401">#401</a> from dart-lang/merge-logging-package</li>
<li><a href="https://github.com/dart-lang/core/commit/63e934ca51d97b70b1a1a892e05b090c636bcfa3"><code>63e934c</code></a> contribute a issue template for package:args (<a href="https://github.com/dart-lang/core/tree/main/pkgs/issues/139">#139</a>)</li>
<li><a href="https://github.com/dart-lang/core/commit/bab3e3c09a443bc34f05743ad3a06e3c55147812"><code>bab3e3c</code></a> Moving fixes</li>
<li><a href="https://github.com/dart-lang/core/commit/903e5cd99371b7cc2b36d4d10e36ad0d3c65b0af"><code>903e5cd</code></a> Add issue template and other fixes</li>
<li><a href="https://github.com/dart-lang/core/commit/600817add9ddf3d0817a69ad05aec0cb3c2ae1a8"><code>600817a</code></a> Merge package:path into the core monorepo</li>
<li><a href="https://github.com/dart-lang/core/commit/9d2259130b40098af7dccfd3786adcfb14b25718"><code>9d22591</code></a> Moving fixes</li>
<li><a href="https://github.com/dart-lang/core/commit/66b5ae36273ec97f05f95e8d6a6a8cd21ff2f6cb"><code>66b5ae3</code></a> Add issue template and other fixes</li>
<li><a href="https://github.com/dart-lang/core/commit/b883be67d06b62d889d3d632850da4512152b382"><code>b883be6</code></a> Merge package:os_detect into the core monorepo</li>
<li>Additional commits viewable in <a href="https://github.com/dart-lang/core/commits/path-v1.9.1/pkgs">compare view</a></li>
</ul>
</details>
<br />

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</details>

test_utilities/pubspec.yaml

@@ -12,4 +12,4 @@ environment:
 dev_dependencies:
   args: 2.6.0
   yaml: 3.1.2
-  path: 1.9.0
+  path: 1.9.1