chore(deps): bump postgres

Bumps the docker-compose-deps group with 1 update in the / directory: postgres.


Updates `postgres` from 16-alpine to 18-alpine

---
updated-dependencies:
- dependency-name: postgres
  dependency-version: 18-alpine
  dependency-type: direct:production
  dependency-group: docker-compose-deps
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docker-compose.postgres.yml

@@ -12,7 +12,7 @@ services:
       - DATABASE_URL=postgres://guardian:${POSTGRES_PASSWORD:?set POSTGRES_PASSWORD in .env}@postgres:5432/guardian
 
   postgres:
-    image: postgres:16-alpine
+    image: postgres:18-alpine
     ports:
       - "5432:5432"
     volumes:

docker-compose.registry.yml

@@ -34,7 +34,7 @@ services:
       - DATABASE_URL=postgres://guardian:${POSTGRES_PASSWORD:?set POSTGRES_PASSWORD in .env.registry}@postgres:5432/guardian
 
   postgres:
-    image: postgres:16-alpine
+    image: postgres:18-alpine
     volumes:
       - guardian-postgres:/var/lib/postgresql/data
     environment: