Restrict benchmarking push to php org

Otherwise the job will just fail due to missing ssh keys

Author: iluuu1994

.github/workflows/push.yml

@@ -217,6 +217,7 @@ jobs:
         run: .github/scripts/windows/test.bat
   BENCHMARKING:
     name: BENCHMARKING
+    if: github.repository_owner == 'php' || github.event_name == 'pull_request'
     runs-on: ubuntu-22.04
     steps:
       - name: git checkout