Bump scratch-gui from fb4b567 to a778a8f

Bumps [scratch-gui](https://github.com/TurboWarp/scratch-gui) from `fb4b567` to `a778a8f`.
- [Commits](TurboWarp/scratch-gui@fb4b567...a778a8f)

---
updated-dependencies:
- dependency-name: scratch-gui
  dependency-version: a778a8f9f4372dad39ba09228e2623473d8f0d57
  dependency-type: direct:development
...

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

Author: dependabot[bot]