chore(deps): bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v4...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] <support@github.com>

.github/workflows/system.yml

@@ -137,7 +137,7 @@ jobs:
           echo "SAFE_RUN_SET=$SAFE_RUN_SET" >> $GITHUB_ENV
 
       - name: Upload command coverage log
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-${{ env.SAFE_RUN_SET }}-${{ matrix.RECREATE_BUCKETS }}
           path: coverage.log