Update PostgreSQL to 15.14 (#1898)

Author: bwbroersma

docker/defaults.env

@@ -16,7 +16,7 @@ AUTO_UPDATE_TO=
 # Container images/versions to use for external containers
 DOCKER_IMAGE_REDIS=redis:7.4.1-alpine
 DOCKER_IMAGE_RABBITMQ=rabbitmq:3.13.7-management-alpine
-DOCKER_IMAGE_POSTGRES=postgres:15.10-alpine
+DOCKER_IMAGE_POSTGRES=postgres:15.14-alpine3.22
 DOCKER_IMAGE_ROUTINATOR=nlnetlabs/routinator:v0.14.0
 DOCKER_IMAGE_PROMETHEUS=prom/prometheus:v3.0.1
 DOCKER_IMAGE_PROMETHEUS_ALERTMANAGER=prom/alertmanager:v0.27.0