Bump scratch-gui from 63a507a to b4ff9dd

Bumps [scratch-gui](https://github.com/TurboWarp/scratch-gui) from `63a507a` to `b4ff9dd`.
- [Commits](TurboWarp/scratch-gui@63a507a...b4ff9dd)

---
updated-dependencies:
- dependency-name: scratch-gui
  dependency-version: b4ff9dd2d7b7f2b350bdeeee5338434d50d7c147
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]