fix(deps): update rust crate zeroize to >=1, <1.7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
zeroize	dependencies	minor	>=1, <1.5 -> >=1, <1.7

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Release Notes

RustCrypto/utils (zeroize)

v1.6.0

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Added

• Impl Zeroize for core::num::Wrapping (#​818)
• Impl Zeroize for str and Box<str> (#​842)

Changed

• 2021 edition upgrade; MSRV 1.56 (#​869)

v1.5.7

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Added

• Optional serde support (#​780)

v1.5.6

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Added

• #[inline(always)] annotations (#​772)
• #[ignore] attribute on flaky CString test (#​776)

Changed

• Factor integration tests into tests/ (#​771)

v1.5.5

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Added

• Impl Zeroize for std::ffi::CString (#​759)
• AsRef<T> and AsMut<T> impls for Zeroizing (#​761)

v1.5.4

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Added

• Nightly-only upport for zeroizing ARM64 SIMD registers (#​749)

v1.5.3

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Fixed

• Deriving ZeroizeOnDrop on DerefMut (#​739)

v1.5.2

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Fixed

• Ambiguous method for AssertZeroizeOnDrop (#​725)

v1.5.1

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Fixed

• Double mut on AssertZeroizeOnDrop (#​719)

v1.5.0

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Added

• Zeroize impls for PhantomData, PhantomPinned, and tuples with 0-10 elements (#​660)
• #[zeroize(bound = "T: MyTrait")] (#​663)
• ZeroizeOnDrop trait and custom derive (#​699, #​700, #​703)

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