Bump zerocopy from 0.7.11 to 0.7.20 in /rust (#387)

Bumps [zerocopy](https://github.com/google/zerocopy) from 0.7.11 to 0.7.20.
- [Commits](google/zerocopy@v0.7.11...v0.7.20)

---
updated-dependencies:
- dependency-name: zerocopy
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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