Disable dotnet rollForward

[rajsite]

Pull Request

🤨 Rationale

The dotnet restore command is failing inconsistently with messages such as:

/home/runner/work/nimble/nimble/packages/blazor-workspace/Examples/Demo.Client/Demo.Client.csproj : error NU1004: The package reference Microsoft.NET.ILLink.Tasks version has changed from [8.0.10, ) to [8.0.11, ).The packages lock file is inconsistent with the project dependencies so restore can't be run in locked mode. Disable the RestoreLockedMode MSBuild property or pass an explicit --force-evaluate option to run restore to update the lock file. [/home/runner/work/nimble/nimble/packages/blazor-workspace/BlazorWorkspace.sln]
  Failed to restore /home/runner/work/nimble/nimble/packages/blazor-workspace/Examples/Demo.Client/Demo.Client.csproj (in 190 ms).

👩‍💻 Implementation

Attempted to disable rollForward so that exact SDK versions will be used on CI and locally as described here: dotnet/runtime#100082 (comment), but also as described that does not seem reliable.

🧪 Testing

Rely on CI builds.

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[rajsite]

Doesn't seem to fix the issue as discussed here: dotnet/runtime#100082 (comment)
Gonna do a manual dep upgrade to unbreak CI as Issue does not seemed resolved, see: dotnet/sdk#39635