build(deps): bump zerocopy from 0.6.1 to 0.6.3

Bumps [zerocopy](https://github.com/google/zerocopy) from 0.6.1 to 0.6.3.
- [Commits](google/zerocopy@v0.6.1...v0.6.3)

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

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