Update dependency Polyfill to 7.21.0 (#1230)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Directory.Packages.props

@@ -22,7 +22,7 @@
         <PackageVersion Include="JetBrains.dotCover.CommandLineTools" Version="2024.3.6" />
         <PackageVersion Include="JetBrains.ExternalAnnotations" Version="10.2.156" />
         <PackageVersion Include="JetBrains.ReSharper.GlobalTools" Version="2024.3.6" />
-        <PackageVersion Include="Polyfill" Version="7.20.0" />
+        <PackageVersion Include="Polyfill" Version="7.21.0" />
         <PackageVersion Include="GitVersion.Tool" Version="6.1.0" />
         <PackageVersion Include="Nuke.Common" Version="9.0.4" />
         <PackageVersion Include="ReportGenerator" Version="5.4.4" />