Bump actions/upload-artifact from 2 to 3

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2...v3)

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

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

.github/workflows/tarball.yml

@@ -58,7 +58,7 @@ jobs:
         make tarball
 
     - name: Upload tarball
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: tarball-${{ matrix.go-version }}
         path: nextcloud-spreed-signaling*.tar.gz