chore(deps): update postgres:18.4-alpine docker digest to 96d56f7

Author: renovate[bot]

src/development/stack.yml

@@ -67,7 +67,7 @@ services:
       POSTGRES_DB_FILE: /run/secrets/postgres_db
       POSTGRES_PASSWORD_FILE: /run/secrets/postgres_password
       POSTGRES_USER_FILE: /run/secrets/postgres_user
-    image: postgres:18.4-alpine@sha256:38346350acb3e824c6948e6df7ff4759f48ba09d8ef4cb8d1b6e6db120f56872
+    image: postgres:18.4-alpine@sha256:96d56f7f57c6aacd1fcb908bc83b345ec5f83231ee486dd66a1baadce274db88
     secrets:
     - postgres_db
     - postgres_password