fix(renovate): wrong manager for docker (#398)

Author: DjinnS

renovate.json

@@ -2,7 +2,6 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "config:recommended",
-    "docker:pinDigests",
     ":label(renovate)",
     ":configMigration",
     ":semanticPrefixFix",
@@ -18,8 +17,8 @@
       "matchPackageNames": ["*"]
     },
     {
-      "matchManagers": ["docker"],
-      "matchDepTypes": ["pinDigests"],
+      "matchDatasources": ["docker"],
+      "pinDigests": true,
       "commitMessage": "chore(docker): pin digests",
       "groupName": "docker pin digests",
       "groupSlug": "docker-all-digests"