fix(ci): Fix syntax error in common_cocoapods_cron.yml (#15324)

Author: ncooke3

.github/workflows/common_cocoapods_cron.yml

@@ -49,7 +49,7 @@ on:
 jobs:
   cron-job:
     if: |
-      github.repository == 'firebase/firebase-ios-sdk' && \
+      github.repository == 'firebase/firebase-ios-sdk' &&
       (github.event_name == 'schedule' || github.event_name == 'workflow_dispatch')
     runs-on: ${{ inputs.runs_on }}
     strategy: