Update docker.io/library/postgres Docker tag to v16

renovate.json

@@ -29,20 +29,13 @@
     // https://docs.renovatebot.com/presets-default/#automergestablenonmajor
     {
       "groupName": "all stable non-major dependencies",
-      "groupSlug": "all-stable-minor",
+      "groupSlug": "all-stable-minor-patch",
       "matchCurrentVersion": "!/^0/",
       "matchUpdateTypes": [
-        "minor"
-      ],
-      "excludePackageNames": [
-        "git.hamburg.ccc.de/ccchh/oci-images/keycloak"
+        "minor",
+        "patch"
       ]
     },
-    {
-      "matchUpdateTypes": ["patch"],
-      "matchCurrentVersion": "!/^0/",
-      "automerge": true
-    },
     {
       "matchDatasources": ["docker"],
       "matchPackageNames": ["docker.io/pretix/standalone"],