Tmp: switch to dedicated test suite branch in CI

Author: sd109

.github/workflows/pull-request.yml

@@ -76,6 +76,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: stackhpc/s3-active-storage-compliance-suite
+          ref: feat/reductions-over-axes
           path: compliance
 
       - name: Setup python