Bump bumpalo from 3.11.0 to 3.12.0 in /fuzz

Bumps [bumpalo](https://github.com/fitzgen/bumpalo) from 3.11.0 to 3.12.0.
- [Release notes](https://github.com/fitzgen/bumpalo/releases)
- [Changelog](https://github.com/fitzgen/bumpalo/blob/main/CHANGELOG.md)
- [Commits](fitzgen/bumpalo@3.11.0...3.12.0)

---
updated-dependencies:
- dependency-name: bumpalo
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>