Bump actions/upload-artifact from 3 to 4 (#205)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

.github/workflows/dotnet.yml

@@ -56,7 +56,7 @@ jobs:
       run: cd SharpXMPP.WebSocket && dotnet pack --configuration Release
       if: matrix.os == 'ubuntu-latest'
     - name: Upload the NuGet packages
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: matrix.os == 'ubuntu-latest'
       with:
         name: nuget