Pin DRA scalability jobs to CAPZ 1.20

Author: nojnhuh

config/jobs/kubernetes/sig-scalability/DRA/sig-scalability-periodic-dra.yaml

@@ -17,7 +17,7 @@ periodics:
     extra_refs:
     - org: kubernetes-sigs
       repo: cluster-api-provider-azure
-      base_ref: main
+      base_ref: release-1.20
       path_alias: "sigs.k8s.io/cluster-api-provider-azure"
     - org: kubernetes-sigs
       repo: cloud-provider-azure
@@ -123,7 +123,7 @@ periodics:
     extra_refs:
       - org: kubernetes-sigs
         repo: cluster-api-provider-azure
-        base_ref: main
+        base_ref: release-1.20
         path_alias: "sigs.k8s.io/cluster-api-provider-azure"
       - org: kubernetes-sigs
         repo: cloud-provider-azure