fix(provider/gce): Marking the servergroup caching agents for gce as …

…authoritative for clusters. (#4570)

Co-authored-by: Luke Abraham <luke.abraham@lowes.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

clouddriver-google/src/main/groovy/com/netflix/spinnaker/clouddriver/google/provider/agent/AbstractGoogleServerGroupCachingAgent.java

@@ -123,7 +123,7 @@ abstract class AbstractGoogleServerGroupCachingAgent
       ImmutableSet.of(
           AUTHORITATIVE.forType(SERVER_GROUPS.getNs()),
           AUTHORITATIVE.forType(APPLICATIONS.getNs()),
-          INFORMATIVE.forType(CLUSTERS.getNs()),
+          AUTHORITATIVE.forType(CLUSTERS.getNs()),
           INFORMATIVE.forType(LOAD_BALANCERS.getNs()));
 
   private static final String ON_DEMAND_TYPE =