Bump zeroize from 1.7.0 to 1.8.0 (#595)

Bumps [zeroize](https://github.com/RustCrypto/utils) from 1.7.0 to 1.8.0.
- [Commits](RustCrypto/utils@zeroize-v1.7.0...zeroize-v1.8.0)

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

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Author: dependabot[bot]