Update go (#40)

Reviewed-on: phoenix/textsender-auth#40
Co-authored-by: phoenix <mail@kundeng.us>
Co-committed-by: phoenix <mail@kundeng.us>

docker-compose.yaml

@@ -18,7 +18,7 @@ services:
 
   # PostgreSQL Database Service
   auth_db:
-    image: postgres:18.0-alpine # Use an official Postgres image (Alpine variant is smaller)
+    image: postgres:18.3-alpine # Use an official Postgres image (Alpine variant is smaller)
     container_name: textsender_auth_db # Optional: Give the container a specific name
     environment:
       # These MUST match the user, password, and database name in the DATABASE_URL above