Bump zerocopy from 0.7.22 to 0.7.31 in /tools/runtime-codegen

Bumps [zerocopy](https://github.com/google/zerocopy) from 0.7.22 to 0.7.31.
- [Release notes](https://github.com/google/zerocopy/releases)
- [Changelog](https://github.com/google/zerocopy/blob/main/CHANGELOG.md)
- [Commits](https://github.com/google/zerocopy/compare/v0.7.22...v0.7.31)

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

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