build(deps): bump actions/setup-dotnet from 4 to 6

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 4 to 6.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](https://github.com/actions/setup-dotnet/compare/v4...v6)

---
updated-dependencies:
- dependency-name: actions/setup-dotnet
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/release.yml

@@ -262,7 +262,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
       - name: Setup .NET 8
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v6
         with:
           dotnet-version: "8.0.x"
       - name: Publish gen1tls (win-x64 Native AOT)