Bump Polyfill from 1.28.0 to 4.6.0

Bumps [Polyfill](https://github.com/SimonCropp/Polyfill) from 1.28.0 to 4.6.0.
- [Commits](SimonCropp/Polyfill@1.28.0...4.6.0)

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

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

src/core/Akka/Akka.csproj

@@ -12,7 +12,7 @@
   </ItemGroup>
 
   <ItemGroup>
-      <PackageReference Include="Polyfill" Version="1.28.0" PrivateAssets="all" />
+      <PackageReference Include="Polyfill" Version="4.6.0" PrivateAssets="all" />
       <PackageReference Include="Microsoft.Extensions.ObjectPool" Version="$(MsExtVersion)" />
       <PackageReference Include="Newtonsoft.Json" Version="$(NewtonsoftJsonVersion)" />
       <PackageReference Include="System.Reflection.Emit" Version="4.7.0" />