revert operator sdk version

...ava/de/ozgcloud/operator/ElasticsearchReconcilerTest.java

...loud/operator/keycloak/client/OzgCloudKeycloakClient.java

...gcloud/operator/keycloak/group/OzgCloudKeycloakGroup.java

...gcloud/operator/keycloak/realm/OzgCloudKeycloakRealm.java

...ozgcloud/operator/keycloak/user/OzgCloudKeycloakUser.java

...perator/keycloak/client/KeycloakClientReconcilerTest.java

.../operator/keycloak/group/KeycloakGroupReconcilerTest.java

.../operator/keycloak/realm/KeycloakRealmReconcilerTest.java

pom.xml