chore(renovate): group datafusion/deltalake/object_store deps together

Author: timvw

.github/renovate.json

@@ -3,6 +3,12 @@
     "config:base"
   ],
   "packageRules": [
+    {
+      "groupName": "datafusion ecosystem",
+      "matchManagers": ["cargo"],
+      "matchPackagePatterns": ["^datafusion", "^deltalake", "^object_store"],
+      "commitMessageTopic": "datafusion ecosystem dependencies"
+    },
     {
       "matchPackagePatterns": [
         "*"