build(deps): bump zeroize from 1.5.7 to 1.6.0 (#405)

Bumps [zeroize](https://github.com/RustCrypto/utils) from 1.5.7 to 1.6.0.
- [Release notes](https://github.com/RustCrypto/utils/releases)
- [Commits](RustCrypto/utils@zeroize-v1.5.7...zeroize-v1.6.0)

---
updated-dependencies:
- dependency-name: zeroize
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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