Bump Polyfill from 7.8.0 to 7.9.1 (#306)

Bumps [Polyfill](https://github.com/SimonCropp/Polyfill) from 7.8.0 to
7.9.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/aa8588448458a7084262176783dad15b1f0dadac"><code>aa85884</code></a>
Update Directory.Build.props</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/952caad87f24934597ae8ae0d76774d65f7ec8e5"><code>952caad</code></a>
fix Compile Condition</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/5fefc88c04fb5d8e54a3344dc4e17126ea0295c5"><code>5fefc88</code></a>
Merge branch 'main' of <a
href="https://github.com/SimonCropp/Polyfill">https://github.com/SimonCropp/Polyfill</a></li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/394a7a8d8067ed5ded1d0e9073a47a83c4a59553"><code>394a7a8</code></a>
Guard missing in nuget</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/da228039216f3654e40253078753455831d2552d"><code>da22803</code></a>
Update Directory.Build.props</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/5523739748a884f056a084377c3ef4772c192adb"><code>5523739</code></a>
docs</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/49564db75281f4f2622fbf98aef38faf98e0af6c"><code>49564db</code></a>
Merge branch 'main' of <a
href="https://github.com/SimonCropp/Polyfill">https://github.com/SimonCropp/Polyfill</a></li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/76123424a1b91b4ccdeaef4b4c66e1a8257c1572"><code>7612342</code></a>
Delegate EnumerateInvocationList (<a
href="https://redirect.github.com/SimonCropp/Polyfill/issues/271">#271</a>)</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/c5b91a2241619207dcb4911f1b94a785e8a00897"><code>c5b91a2</code></a>
Update BuildApiTest.cs</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/ccef6b954f047ebadeab46fbbdef4e49935914da"><code>ccef6b9</code></a>
.</li>
<li>Additional commits viewable in <a
href="https://github.com/SimonCropp/Polyfill/compare/7.8.0...7.9.1">compare
view</a></li>
</ul>
</details>
<br />


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build/targets/compiler/Packages.props

@@ -1,5 +1,5 @@
 <Project>
   <ItemGroup>
-    <PackageVersion Include="Polyfill" Version="7.8.0" />
+    <PackageVersion Include="Polyfill" Version="7.9.1" />
   </ItemGroup>
 </Project>