Dependencies: tune Renovate grouping and release-age policy (#324)

Author: rappm

renovate.json

@@ -1,6 +1,21 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "config:recommended"
+  "extends": ["config:recommended"],
+  "semanticCommits": "disabled",
+  "commitMessagePrefix": "Dependencies:",
+  "prConcurrentLimit": 3,
+  "rangeStrategy": "bump",
+  "minimumReleaseAge": "7 days",
+  "packageRules": [
+    {
+      "description": "Group all non-major updates together",
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "all non-major dependencies"
+    },
+    {
+      "description": "No minimum age for security updates",
+      "matchCategories": ["security"],
+      "minimumReleaseAge": "0 days"
+    }
   ]
 }