Use Postgresql 14 for Micronaut tests

micronaut-app/src/test/resources/application-test.yml

@@ -1,4 +1,4 @@
 datasources:
   default:
-    url: jdbc:tc:postgresql:12:///postgres
+    url: jdbc:tc:postgresql:14:///postgres
     driver-class-name: org.testcontainers.jdbc.ContainerDatabaseDriver