Update postgres to version 15 in docker-compose files

docker/docker-compose.build.yml

@@ -17,7 +17,7 @@ services:
       redis:
         condition: service_healthy
   postgres:
-    image: postgres:12
+    image: postgres:15
     env_file:
       - ../.env
     healthcheck:

docker/docker-compose.dev.yml

@@ -1,7 +1,7 @@
 version: '3.9'
 services:
   postgres:
-    image: postgres:12
+    image: postgres:15
     container_name: postgres
     restart: unless-stopped
     env_file:

docker/docker-compose.yml

@@ -17,7 +17,7 @@ services:
       redis:
         condition: service_healthy
   postgres:
-    image: postgres:12
+    image: postgres:15
     env_file:
       - ../.env
     healthcheck: