renovate: bump the protocol submodule automatically

Author: u9g

renovate.json

@@ -3,6 +3,9 @@
   "extends": ["config:base", "helpers:pinGitHubActionDigests"],
   "minimumReleaseAge": "2 weeks",
   "commitBody": "Generated by renovateBot",
+  "git-submodules": {
+    "enabled": true
+  },
   "packageRules": [
     {
       "matchManagers": ["github-actions"],
@@ -30,6 +33,11 @@
       "matchFileNames": ["livekit-rtc/jupyter-html/package.json"],
       "matchPackageNames": ["!livekit-client", "!/^@livekit//"],
       "groupName": "jupyter-html deps"
+    },
+    {
+      "matchManagers": ["git-submodules"],
+      "matchDepNames": ["livekit-rtc/rust-sdks"],
+      "enabled": false
     }
   ]
 }