Fix merge-dependabot workflow on macOS

Author: ppkarwasz

.github/workflows/merge-dependabot.yaml

@@ -30,7 +30,9 @@ jobs:
 
   build:
     if: github.repository == 'apache/logging-log4j2' && github.event_name == 'pull_request_target' && github.actor == 'dependabot[bot]'
-    uses: apache/logging-parent/.github/workflows/build-reusable.yaml@rel/11.0.0
+    # Temporary switch to `@fix/macos-java-8` to see how the situation evolves with macOS runners
+    uses: apache/logging-parent/.github/workflows/build-reusable.yaml@fix/macos-java-8
+    # uses: apache/logging-parent/.github/workflows/build-reusable.yaml@rel/11.0.0
     with:
       java-version: |
         8