deps(CI): Update actions/upload-artifact action to v7

Author: renovate[bot]

.github/workflows/be_base.yaml

@@ -31,7 +31,7 @@ jobs:
           --log-junit=coverage/junit.xml
         # https://infection.github.io/guide/command-line-options.html#coverage
       - if: always() && (steps.phpunit.outcome == 'success' || steps.phpunit.outcome == 'failure')
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: coverage-${{ inputs.runs-on }}
           path: be/coverage/clover.xml