message: update Slate as fixes have now landed
diff: "react-dom": "^15.6.0",
  "react-gemini-scrollbar": "matrix-org/react-gemini-scrollbar#5e97aef",
  "resize-observer-polyfill": "^1.5.0",
  - "slate": "0.33.4",
  + "slate": "0.34.7",
  "slate-react": "^0.12.4",
  "slate-html-serializer": "^0.6.1",
  "slate-md-serializer": "matrix-org/slate-md-serializer#f7c4ad3",
  