Bump scratch-vm from bf4a245 to a2cacea (#315)

Bumps [scratch-vm](https://github.com/TurboWarp/scratch-vm) from `bf4a245` to `a2cacea`.
- [Release notes](https://github.com/TurboWarp/scratch-vm/releases)
- [Commits](TurboWarp/scratch-vm@bf4a245...a2cacea)

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

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

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

Author: dependabot[bot]