csi-driver: use latest CAPZ release

Author: jackfrancis

config/jobs/kubernetes-csi/csi-driver-nfs/csi-driver-nfs-unmanaged.yaml

@@ -166,7 +166,7 @@ presubmits:
     extra_refs:
       - org: kubernetes-sigs
         repo: cluster-api-provider-azure
-        base_ref: release-1.18
+        base_ref: release-1.21
         path_alias: sigs.k8s.io/cluster-api-provider-azure
         workdir: true
       - org: kubernetes-sigs
@@ -220,7 +220,7 @@ presubmits:
     extra_refs:
       - org: kubernetes-sigs
         repo: cluster-api-provider-azure
-        base_ref: release-1.18
+        base_ref: release-1.21
         path_alias: sigs.k8s.io/cluster-api-provider-azure
         workdir: true
       - org: kubernetes-sigs

config/jobs/kubernetes-csi/csi-driver-smb/csi-driver-smb-config.yaml

@@ -138,7 +138,7 @@ presubmits:
     extra_refs:
       - org: kubernetes-sigs
         repo: cluster-api-provider-azure
-        base_ref: release-1.18
+        base_ref: release-1.21
         path_alias: sigs.k8s.io/cluster-api-provider-azure
         workdir: true
       - org: kubernetes-sigs
@@ -192,7 +192,7 @@ presubmits:
     extra_refs:
       - org: kubernetes-sigs
         repo: cluster-api-provider-azure
-        base_ref: release-1.18
+        base_ref: release-1.21
         path_alias: sigs.k8s.io/cluster-api-provider-azure
         workdir: true
       - org: kubernetes-sigs
@@ -249,7 +249,7 @@ presubmits:
     extra_refs:
       - org: kubernetes-sigs
         repo: cluster-api-provider-azure
-        base_ref: release-1.18
+        base_ref: release-1.21
         path_alias: sigs.k8s.io/cluster-api-provider-azure
         workdir: true
       - org: kubernetes-sigs
@@ -310,7 +310,7 @@ presubmits:
     extra_refs:
       - org: kubernetes-sigs
         repo: cluster-api-provider-azure
-        base_ref: release-1.18
+        base_ref: release-1.21
         path_alias: sigs.k8s.io/cluster-api-provider-azure
         workdir: true
       - org: kubernetes-sigs
@@ -368,7 +368,7 @@ presubmits:
     extra_refs:
       - org: kubernetes-sigs
         repo: cluster-api-provider-azure
-        base_ref: release-1.18
+        base_ref: release-1.21
         path_alias: sigs.k8s.io/cluster-api-provider-azure
         workdir: true
       - org: kubernetes-sigs
@@ -432,7 +432,7 @@ presubmits:
     extra_refs:
       - org: kubernetes-sigs
         repo: cluster-api-provider-azure
-        base_ref: release-1.18
+        base_ref: release-1.21
         path_alias: sigs.k8s.io/cluster-api-provider-azure
         workdir: true
       - org: kubernetes-sigs