Bump Polyfill from 8.9.1 to 9.0.0

---
updated-dependencies:
- dependency-name: Polyfill
  dependency-version: 9.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -11,7 +11,7 @@
     <PackageVersion Include="NUnit" Version="4.4.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="5.2.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.162" />
-    <PackageVersion Include="Polyfill" Version="8.9.1" />
+    <PackageVersion Include="Polyfill" Version="9.0.0" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.2" />
     <PackageVersion Include="Verify.NUnit" Version="31.5.3" />
   </ItemGroup>