Bump actions/upload-artifact from 2 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...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]>

.github/workflows/buildPi.yml

@@ -59,7 +59,7 @@ jobs:
         run: echo "artifact_name=ohd-kernel-${{ matrix.PLATFORM }}-${{ matrix.DISTRO }}-${GITHUB_REF##*/}" >> $GITHUB_ENV
 
       - name: Package firmware ${{ matrix.PLATFORM }} ${{ matrix.DISTRO }}
-        uses: 'actions/upload-artifact@v2'
+        uses: 'actions/upload-artifact@v4'
         with:
           name: "${{ env.artifact_name }}"
           path: |