Update Rust crate zeroize to 1.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
zeroize	dependencies	minor	1.5.7 -> 1.6.0

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Release Notes

RustCrypto/utils

### [`v1.6.0`](https://togithub.com/RustCrypto/utils/blob/HEAD/zeroize/CHANGELOG.md#​160-2023-03-26) [Compare Source](https://togithub.com/RustCrypto/utils/compare/zeroize-v1.5.7...zeroize-v1.6.0) ##### Added - Impl `Zeroize` for `core::num::Wrapping` ([#​818]) - Impl `Zeroize` for `str` and `Box` ([#​842]) ##### Changed - 2021 edition upgrade; MSRV 1.56 ([#​869]) [#​818]: https://togithub.com/RustCrypto/utils/pull/818 [#​842]: https://togithub.com/RustCrypto/utils/pull/842 [#​869]: https://togithub.com/RustCrypto/utils/pull/869

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