⬇️(frontend) rollback LiveKit component library from 2.9.0 to 2.8.1

Downgrade @livekit/components-js due to bug introduced in version 2.9.0.
Issue has been reported to upstream maintainers at:
https://github.com/livekit/components-js/issues/1158

Reverting to last known stable version until fix is available.

src/frontend/package.json

@@ -13,7 +13,7 @@
     "check": "prettier --check ./src"
   },
   "dependencies": {
-    "@livekit/components-react": "2.9.3",
+    "@livekit/components-react": "2.8.1",
     "@livekit/components-styles": "1.1.5",
     "@livekit/track-processors": "0.5.6",
     "@pandacss/preset-panda": "0.53.6",