Update default upgrade test versions

Author: jmckulk

Makefile

@@ -222,11 +222,11 @@ check-kuttl: ## example command: make check-kuttl KUTTL_TEST='
 --config testing/kuttl/kuttl-test.yaml
 
 .PHONY: generate-kuttl
-generate-kuttl: export KUTTL_PG_UPGRADE_FROM_VERSION ?= 14
-generate-kuttl: export KUTTL_PG_UPGRADE_TO_VERSION ?= 15
-generate-kuttl: export KUTTL_PG_VERSION ?= 15
-generate-kuttl: export KUTTL_POSTGIS_VERSION ?= 3.3
-generate-kuttl: export KUTTL_PSQL_IMAGE ?= registry.developers.crunchydata.com/crunchydata/crunchy-postgres:ubi8-15.4-1
+generate-kuttl: export KUTTL_PG_UPGRADE_FROM_VERSION ?= 15
+generate-kuttl: export KUTTL_PG_UPGRADE_TO_VERSION ?= 16
+generate-kuttl: export KUTTL_PG_VERSION ?= 16
+generate-kuttl: export KUTTL_POSTGIS_VERSION ?= 3.4
+generate-kuttl: export KUTTL_PSQL_IMAGE ?= registry.developers.crunchydata.com/crunchydata/crunchy-postgres:ubi8-16.0-0
 generate-kuttl: export KUTTL_TEST_DELETE_NAMESPACE ?= kuttl-test-delete-namespace
 generate-kuttl: ## Generate kuttl tests
 [ ! -d testing/kuttl/e2e-generated ] || rm -r testing/kuttl/e2e-generated