chore(deps): bump Polyfill from 6.3.0 to 6.4.0 (#191)

Author: dependabot[bot]

Directory.Packages.props

@@ -16,7 +16,7 @@
     <PackageVersion Include="coverlet.msbuild" Version="6.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.0" />
     <PackageVersion Include="NetEvolve.Extensions.XUnit" Version="2.2.12" />
-    <PackageVersion Include="Polyfill" Version="6.3.0" />
+    <PackageVersion Include="Polyfill" Version="6.4.0" />
     <PackageVersion Include="xunit" Version="2.9.0" />
   </ItemGroup>