[release/6.0] update the MicrosoftNetSdkWorkloadManifestReaderVersion used

[MichaelSimons]

Currently MicrosoftNetSdkWorkloadManifestReaderVersion 6.0.100-preview.5.21254.11 is used - https://github.com/dotnet/arcade/blob/release/6.0/eng/Versions.props#L86. In Preview 7 there were some breaking changes made with - dotnet/sdk@b8ade8e. Please update Arcade to build with a newer version and address the resulting build breaks:

  /repos/tarball1/src/arcade.474307e526160c813c9fd58060eb8356ccca6099/artifacts/source-build/self/src/src/Microsoft.DotNet.Build.Tasks.Workloads/src/GenerateWorkloadMsis.cs(124,33): error CS1061: 'BaseWorkloadDefinition' does not contain a definition for 'Platforms' and no accessible extension method 'Platforms' accepting a first argument of type 'BaseWorkloadDefinition' could be found (are you missing a using directive or an assembly reference?) [/repos/tarball1/src/arcade.474307e526160c813c9fd58060eb8356ccca6099/artifacts/source-build/self/src/src/Microsoft.DotNet.Build.Tasks.Workloads/src/Microsoft.DotNet.Build.Tasks.Workloads.csproj]
  /repos/tarball1/src/arcade.474307e526160c813c9fd58060eb8356ccca6099/artifacts/source-build/self/src/src/Microsoft.DotNet.Build.Tasks.Workloads/src/GenerateWorkloadMsis.cs(124,58): error CS1061: 'BaseWorkloadDefinition' does not contain a definition for 'Platforms' and no accessible extension method 'Platforms' accepting a first argument of type 'BaseWorkloadDefinition' could be found (are you missing a using directive or an assembly reference?) [/repos/tarball1/src/arcade.474307e526160c813c9fd58060eb8356ccca6099/artifacts/source-build/self/src/src/Microsoft.DotNet.Build.Tasks.Workloads/src/Microsoft.DotNet.Build.Tasks.Workloads.csproj]

This is currently impacting source-build as it requires building with the latest bits.

This looks like it could be part of the new operational epic, but maybe until that's in place, and since it's impacting source-build, FR?

[markwilkie]

@ilyas1974 / @MattGal - thoughts?

[ilyas1974]

As we are still ramping up in the operations space and this is something that is needed in the short term, I am adding it to FR.

[MattGal]

Oops also needed a release/6.0 version