Release candidate 39.
Publish-pipeline fixes carried from rc.38:
- NuGet: thin meta csproj (fixes HTTP 413 on publish)
- Docker: gha cache-export ignore-error (image already pushed by digest)
- Go module tag job runs after the Swift tag-move (fixes ref-mismatch race)
- Dart: freezed lock refreshed to stable 3.2.5 for frb 2.12
Regenerated with alef 0.47.1.