Bump js-sdk for MatrixRTC fixes (#2688)

Full diff https://github.com/matrix-org/matrix-js-sdk/compare/v34.7.0...0a29063bc9e61ee70ca43820d4bb91f6a27f1237

Relevant PRs included:

- Do not rotate MatrixRTC media encryption key when a new member joins a session #4472
- Refactor/simplify Promises in MatrixRTCSession #4466
- Prepare delayed call leave events more reliably #4447
- Fix DelayedEventInfo type #4446
- Fix MatrixRTC sender key wrapping #4441

package.json

@@ -84,7 +84,7 @@
     "livekit-client": "^2.5.7",
     "lodash": "^4.17.21",
     "loglevel": "^1.9.1",
-    "matrix-js-sdk": "^34.7.0",
+    "matrix-js-sdk": "matrix-org/matrix-js-sdk#0a29063bc9e61ee70ca43820d4bb91f6a27f1237",
     "matrix-widget-api": "^1.8.2",
     "normalize.css": "^8.0.1",
     "observable-hooks": "^4.2.3",