Bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/push_pr_release.yml

@@ -61,7 +61,7 @@ jobs:
 
       - name: 📦 Upload
         if: ${{ github.event_name == 'repository_dispatch' || github.event_name == 'workflow_dispatch' || github.event_name == 'pull_request' }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ env.HYPERBIAN }}
           path: pi-gen/deploy/*.zip