justfile,readme: bump postgres to 15.3-alpine3.18

README.md

@@ -75,7 +75,7 @@ just dbstop
 podman run --pod pcmt --replace -d --name "pcmt-pg" --rm \
     -e POSTGRES_INITDB_ARGS="--auth-host=scram-sha-256 --auth-local=scram-sha-256" \
     -e POSTGRES_PASSWORD=postgres -v $PWD/tmp/db:/var/lib/postgresql/data \
-    docker.io/library/postgres:15.2-alpine3.17
+    docker.io/library/postgres:15.3-alpine3.18
 
 # run the application in the pod (assuming that you have built it as in the
 # previous example). do note that we're connecting to the db using its

justfile

@@ -87,7 +87,7 @@ dbstart:
 	--health-interval 10s \
 	--health-timeout 1s \
 	--health-start-period=5s \
-	docker.io/library/postgres:15.2-alpine3.17
+	docker.io/library/postgres:15.3-alpine3.18
 
 # stop pg.
 dbstop: