Bump zerocopy from 0.7.26 to 0.7.31 in /fuzz (#9)

Bumps [zerocopy](https://github.com/google/zerocopy) from 0.7.26 to 0.7.31.
- [Release notes](https://github.com/google/zerocopy/releases)
- [Changelog](https://github.com/google/zerocopy/blob/main/CHANGELOG.md)
- [Commits](google/zerocopy@v0.7.26...v0.7.31)

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

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