chore(renovate): group leptos related PRs and auto update Cargo.lock

Author: 404Simon

renovate.json

@@ -2,5 +2,30 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "config:recommended"
-  ]
+  ],
+  "packageRules": [
+    {
+      "matchPackageNames": [
+        "leptos",
+        "leptos_meta",
+        "leptos_router",
+        "leptos_axum"
+      ],
+      "groupName": "leptos monorepo"
+    },
+    {
+      "matchUpdateTypes": [
+        "minor",
+        "patch"
+      ],
+      "automerge": false
+    }
+  ],
+  "lockFileMaintenance": {
+    "enabled": true,
+    "automerge": true,
+    "schedule": [
+      "before 5am on monday"
+    ]
+  }
 }