fix(postgres): Adjust default memory requests after some instances seem to run OOM

infrastructure/postgres/release.yaml

@@ -23,6 +23,9 @@ spec:
   values:
     rbac:
       createAggregateClusterRoles: true
+    configPostgresPodResources:
+      default_memory_limit: 1Gi
+      default_memory_request: 500Mi
     configGeneral:
       sidecars:
         - name: "exporter"