Fix merge queue (open-telemetry#2121)

Author: trask

.github/workflows/changelog.yml

@@ -9,6 +9,7 @@ on:
     types: [opened, ready_for_review, edited, synchronize, reopened, labeled, unlabeled]
     branches:
       - main
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref }}