build(deps): update postgres docker tag to v9.6.24

Author: renovate[bot]

contrib/docker-compose.yml

@@ -10,7 +10,7 @@
 version: '3.1'
 services:
   db:
-    image: postgres:9.6.23
+    image: postgres:9.6.24
     environment:
       - POSTGRES_PASSWORD=odoo
       - POSTGRES_USER=odoo