Merge Renovate PRs automatically (patch only) (#3021)

https://docs.renovatebot.com/key-concepts/automerge/

renovate.json

@@ -1,7 +1,12 @@
 {
   "extends": [
     "config:base",
-    "helpers:pinGitHubActionDigests"
+    "helpers:pinGitHubActionDigests",
+    ":automergePatch",
+    ":automergePr",
+    ":automergeRequireAllStatusChecks",
+    ":prConcurrentLimitNone",
+    ":separatePatchReleases"
   ],
   "baseBranches": ["release/4.1.x", "release/4.2.x", "release/5.0.x"],
   "dependencyDashboard": true,
@@ -20,7 +25,6 @@
   "schedule": [
     "before 2am"
   ],
-  "separateMinorPatch": true,
   "vulnerabilityAlerts": {
     "labels": ["security"],
     "assignees": ["team:committers", "team:metrics"]