CI flake: Workload manifest dependency version is lower than version required

Detected by CI Gremlin after a failed GitHub Actions attempt succeeded on rerun.

Tests:

• Smoketests (Windows)

Error:
Process completed with exit code 1.

Installation rollback failed: Workload manifest dependency 'Microsoft.NET.Workload.Emscripten.net7' version '8.0.27' is lower than version '8.0.28' required by manifest 'microsoft.net.workload.mono.toolchain.net7' [C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.workload.mono.toolchain.net7\8.0.28\WorkloadManifest.json]
Workload update failed: Workload manifest dependency 'Microsoft.NET.Workload.Emscripten.net7' version '8.0.27' is lower than version '8.0.28' required by manifest 'microsoft.net.workload.mono.toolchain.net7' [C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.workload.mono.toolchain.net7\8.0.28\WorkloadManifest.json]
NativeCommandExitException: C:\actions-runner\_work\_temp\1004dab9-96ad-4d86-a429-ceda6f30c062.ps1:9
Line |
   9 |  dotnet workload update
     |  ~~~~~~~~~~~~~~~~~~~~~~
     | Program "dotnet.exe" ended with non-zero exit code: 1.
Error: Process completed with exit code 1.

Failed job runs:

• https://github.com/clockworklabs/SpacetimeDB/actions/runs/27217577463/job/80370683369 (Smoketests (Windows), attempt 1 -> 2)

Review the Smoketests (Windows) GitHub Actions job and its dotnet workload update invocation, starting with the failed run linked in the issue. Determine why the Emscripten and mono toolchain manifests disagree; done means the Windows smoke test completes without the workload-update error on a fresh rerun.