Bump libfuzzer-sys from 0.4.10 to 0.4.12 (#1227)

Bumps [libfuzzer-sys](https://github.com/rust-fuzz/libfuzzer) from 0.4.10 to 0.4.12.
- [Changelog](https://github.com/rust-fuzz/libfuzzer/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rust-fuzz/libfuzzer/commits)

---
updated-dependencies:
- dependency-name: libfuzzer-sys
  dependency-version: 0.4.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]