chore(deps): update docker.io/postgres docker tag to v17

docker-compose.yml

@@ -19,7 +19,7 @@ services:
       - matrix
 
   db:
-    image: docker.io/postgres:12.22-alpine@sha256:7c8f4870583184ebadf7f17a6513620aac5f365a7938dc6a6911c1d5df2f481a
+    image: docker.io/postgres:17.3-alpine@sha256:19d45ecfb59f9ff8f440ee99d378abcea273b7d66bbac1cf1f9d6e41d8dcb3f3
     restart: unless-stopped
     environment:
       - POSTGRES_USER=${DC_MATRIX_POSTGRES_USER:-synapse}