bump operator to v1.6.3

.github/ISSUE_TEMPLATE/postgres-operator-issue-template.md

README.md

charts/postgres-operator-ui/Chart.yaml

charts/postgres-operator-ui/index.yaml

charts/postgres-operator-ui/postgres-operator-ui-1.6.3.tgz

charts/postgres-operator-ui/values.yaml

charts/postgres-operator/Chart.yaml

charts/postgres-operator/crds/operatorconfigurations.yaml

charts/postgres-operator/crds/postgresqls.yaml

charts/postgres-operator/index.yaml

charts/postgres-operator/postgres-operator-1.6.3.tgz

charts/postgres-operator/values-crd.yaml

charts/postgres-operator/values.yaml

docs/administrator.md

docs/reference/operator_parameters.md

e2e/tests/test_e2e.py

manifests/complete-postgres-manifest.yaml

manifests/configmap.yaml

manifests/operatorconfiguration.crd.yaml

manifests/postgres-operator.yaml