chore(deps): update postgres docker tag to v13.16

Author: renovate[bot]

data/linux_amd64/docker-compose.yml

@@ -34,7 +34,7 @@ services:
       driver: "local"
 
   db:
-    image: postgres:13.8-alpine@sha256:fc3670fa23119159394dfdb98eee89b30ef5a506791aea6ff7d8a4e73a8cd4a4
+    image: postgres:13.16-alpine@sha256:3540fa889536d0eab050a0906509ecfe777fbd6c376fcf6babfe83f9d81374d9
     environment:
       - POSTGRES_DB=owncloud
       - POSTGRES_PASSWORD=owncloud