Limit patch updates to once per month

Author: tpoliaw

.github/renovate.json

@@ -4,6 +4,12 @@
     "config:recommended"
   ],
   "packageRules": [
+      {
+          "groupName": "patches",
+          "matchUpdateTypes": ["patch"],
+          "desription": "Limit patch updates to once per month",
+          "schedule": ["* * 1 * *"]
+      },
       {
           "groupName": "tracing",
           "matchDepNames": ["tracing*"]