fix: typo in test

Signed-off-by: Itay Grudev <itay@verito.digital>

Author: itay-grudev

charts/cluster/test/barman-plugin-migration/08-data_test.yaml

@@ -12,7 +12,7 @@ spec:
           - name: DB_URI
             valueFrom:
               secretKeyRef:
-                name: recovery-backup-pitr-superuser
+                name: recovery-backup-pitr-cluster-superuser
                 key: uri
         image: alpine:3.19
         command: ['sh', '-c']