Bump Microsoft.Bcl.AsyncInterfaces from 1.0.0 to 6.0.0 (#128)

Bumps [Microsoft.Bcl.AsyncInterfaces](https://github.com/dotnet/runtime) from 1.0.0 to 6.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits/v6.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.Bcl.AsyncInterfaces
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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src/Akka.Hosting.TestKit.Tests/Akka.Hosting.TestKit.Tests.csproj

@@ -9,7 +9,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="1.0.0" />
+        <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="6.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="$(TestSdkVersion)" />
         <PackageReference Include="xunit" Version="$(XunitVersion)" />
         <PackageReference Include="FluentAssertions" Version="6.7.0" />