chore(tests): bump the postgres version used in CI (#6763)

* bump the postgress version used in CI and fix the tests that broke

* sort Grants by raw grant string rather than GrantStrings

* trigger ci

testing/dbtest/docker/Makefile

@@ -6,7 +6,7 @@ DOCKER_ARGS ?= -d
 DOCKER_MIRROR?=docker.io
 REGISTRY_NAME?=hashicorpboundary
 TEST_IMAGE_NAME=postgres
-TEST_IMAGE_TAG ?= $(DOCKER_MIRROR)/$(REGISTRY_NAME)/$(TEST_IMAGE_NAME):12-alpine
+TEST_IMAGE_TAG ?= $(DOCKER_MIRROR)/$(REGISTRY_NAME)/$(TEST_IMAGE_NAME):16-alpine
 PG_OPTS ?=
 TEST_DB_PORT ?= 5432
 TEST_CONTAINER_NAME ?= boundary-sql-tests