Fix YAML syntax error in ci.yml smoke-test job

Wrap labels.*.name in toJSON() so contains() receives a valid string
argument in the GitHub Actions if conditional.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gjtorikian

.github/workflows/ci.yml

@@ -42,7 +42,7 @@ jobs:
 
   smoke-test:
     name: Smoke test (Python ${{ matrix.python }})
-    if: github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'autorelease: pending')
+    if: github.event_name == 'pull_request' && contains(toJSON(github.event.pull_request.labels.*.name), 'autorelease: pending')
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false