fix: upgrade @moss-tools/md-indexer to beta.3, remove pnpm patch

Author: CoderOMaster

vitepress-plugin-moss/package.json

@@ -38,7 +38,7 @@
   },
   "dependencies": {
     "@inferedge/moss": "^1.0.0-beta.5",
-    "@moss-tools/md-indexer": "^1.0.0-beta.2",
+    "@moss-tools/md-indexer": "^1.0.0-beta.3",
     "obug": "^1.0.0"
   },
   "devDependencies": {