Bump Polyfill from 7.5.0 to 7.7.1 (#287)

Bumps [Polyfill](https://github.com/SimonCropp/Polyfill) from 7.5.0 to
7.7.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/a037caae4f2e1e0c723473b0348d9ac1c58e093d"><code>a037caa</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/99a7569d2f13f88c023f2bf8c111397bed60e1f7"><code>99a7569</code></a>
Update Directory.Build.props</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/2a464c5a436cc26fa8a385b2a07611f182888df3"><code>2a464c5</code></a>
Range is only avaliable in net46 when FeatureValueTuple (<a
href="https://redirect.github.com/SimonCropp/Polyfill/issues/259">#259</a>)</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/e78cb61bc44b8e506fed4df181e1e2d4e62833b8"><code>e78cb61</code></a>
Update PolyfillTests_StringBuilder.cs</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/7bb5af4ffd1ab163230cfac150ff606ade14a0a6"><code>7bb5af4</code></a>
Update Directory.Packages.props</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/e9f09e35e9cada318428230cc71834c059ff1a76"><code>e9f09e3</code></a>
docs</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/775731b51cb1017a36a7e9630f90780737641515"><code>775731b</code></a>
cleanup</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/fbe6a271f1d4bdcd3e6e565436b07e5d1c335a62"><code>fbe6a27</code></a>
Update Directory.Build.props</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/d3a396547e410c773fb9bcc333fa6ecfa8adef5b"><code>d3a3965</code></a>
Add KeyValuePair. (<a
href="https://redirect.github.com/SimonCropp/Polyfill/issues/257">#257</a>)</li>
<li><a
href="https://github.com/SimonCropp/Polyfill/commit/13ea0c28628bfd2a3532af7d8d8984e93af7ab97"><code>13ea0c2</code></a>
Update Directory.Build.props</li>
<li>Additional commits viewable in <a
href="https://github.com/SimonCropp/Polyfill/compare/7.5.0...7.7.1">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="7.5.0" />
+    <PackageVersion Include="Polyfill" Version="7.7.1" />
   </ItemGroup>
 </Project>