Bump actions/upload-artifact from 6 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/nuget-release.yml

@@ -48,7 +48,7 @@ jobs:
     
     # Upload artifacts for verification
     - name: Upload NuGet Package
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       with:
         name: ${{ matrix.os }}-nuget-package
         path: artifacts/*.nupkg

.github/workflows/performance-benchmarks.yml

@@ -44,7 +44,7 @@ jobs:
     
     - name: Upload Benchmark Results
       if: always()
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       with:
         name: benchmark-results
         path: benchmark-results/