v1.0.4

Update GitHub Actions to current major versions

Top-level .github/workflows/build.yaml:
- actions/checkout: v4 -> v7
- actions/setup-dotnet: v4 -> v6
- actions/upload-artifact: v4 -> v7
- dotnet/nbgv: v0.4.1 -> v0.5.2
- softprops/action-gh-release: v1 -> v3

src/.github/workflows/build.yaml (older copy of the same workflow):
- actions/checkout: v4 -> v7
- microsoft/setup-msbuild: v1 -> v3
- actions/setup-dotnet: v3 -> v6
- actions/upload-artifact: v3 -> v7
- dotnet/nbgv: v0.4.1 -> v0.5.2
- softprops/action-gh-release: v1 -> v3

No workflow adaptation was needed: upload-artifact/action-gh-release usage
is the standard tag_name/files pattern (no inputs removed across
action-gh-release v1->v3), default persist-credentials still lets the tag
push after checkout succeed, and microsoft/setup-msbuild's v1->v2->v3
changelog is Node-runtime-only with no functional changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>