Update postgres Docker tag to v17

Author: renovate[bot]

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
       # Label used to access the service container
       db:
         # Docker Hub image
-        image: postgres:12.22
+        image: postgres:17.4
         # Set health checks to wait until postgres has started
         options: >-
           --health-cmd pg_isready

docker-compose.services.yml

@@ -5,7 +5,7 @@ services:
   db:
     profiles:
       - backend
-    image: postgres:12.22
+    image: postgres:17.4
     healthcheck:
       test: ["CMD", "pg_isready"]
       interval: 3s