fix(default): remove approveMajorUpdates preset

* this preset only makes sense with Renovate-generated notifications
  which is a paid feature only
* major updates will have a PR generated and be handled manually

Author: dafyddj

default.json

@@ -3,8 +3,7 @@
   "description": "Default preset for use with Saltstack Formulas' repos",
   "enabledManagers": [],
   "extends": [
-    "config:best-practices",
-    ":approveMajorUpdates"
+    "config:best-practices"
   ],
   "ignorePresets": [
     ":maintainLockFilesWeekly"