ci: edit merge group from semantic pr check (#4999)

### Description

Follow up to #4998, edits a trigger which was causing an error in
[Semantic PR Title
Check](https://github.com/valora-inc/wallet/actions/runs/8087407245).

### Related issues

N/A

### Backwards compatibility

N/A

### Network scalability

N/A

.github/workflows/semantic-pr.yml

@@ -17,3 +17,6 @@ jobs:
       - uses: amannn/action-semantic-pull-request@v5
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        # This action can only be run in `pull_request_target` and `pull_request` events
+        # Workaround from https://github.com/amannn/action-semantic-pull-request/issues/236#issuecomment-1695654373
+        if: ${{ github.event_name != 'merge_group' }}