Fix postgresql chart (#6226)

stable/postgresql/Chart.yaml

@@ -1,5 +1,5 @@
 name: postgresql
-version: 0.14.2
+version: 0.14.3
 appVersion: 9.6.2
 description: Object-relational database management system (ORDBMS) with an emphasis on extensibility and on standards-compliance.
 keywords:

stable/postgresql/values.yaml

@@ -138,7 +138,7 @@ probes:
   readiness:
     initialDelay: 5
     timeoutSeconds: 3
-    failureThreshold: 5
+    periodSeconds: 5
 ## Annotations for the deployment and nodes.
 deploymentAnnotations: {}
 podAnnotations: {}