build(deps): bump scratch-vm from 216b5b6 to 847088c (#936)

Bumps [scratch-vm](https://github.com/TurboWarp/scratch-vm) from `216b5b6` to `847088c`.
- [Commits](TurboWarp/scratch-vm@216b5b6...847088c)

---
updated-dependencies:
- dependency-name: scratch-vm
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>