Do not run the PR bot on the merge queue (#2357)

* Do not run the PR bot on the merge queue

* Update ci-pr.yml

Author: LukeMathWalker

.github/workflows/ci-pr.yml

@@ -99,7 +99,7 @@ jobs:
   # The PR bot requires a Docker build image, so make it depend on the `acquire-base-image` job.
   pr_bot:
     name: PR Bot
-    if: ${{ github.event.pull_request.head.repo.full_name == 'awslabs/smithy-rs' || toJSON(github.event.merge_group) != '{}' }}
+    if: ${{ github.event.pull_request.head.repo.full_name == 'awslabs/smithy-rs' }}
     needs: acquire-base-image
     uses: ./.github/workflows/pull-request-bot.yml
     with: