Update log crate to v0.4.21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
log	dependencies	patch	0.4.16 -> 0.4.21

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Release Notes

rust-lang/log (log)

v0.4.21

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v0.4.20

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• Remove rustversion dev-dependency by @​Thomasdezeeuw in https://github.com/rust-lang/log/pull/568
• Remove local_inner_macros usage by @​EFanZh in https://github.com/rust-lang/log/pull/570

v0.4.19

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• Use target_has_atomic instead of the old atomic_cas cfg by @​GuillaumeGomez in https://github.com/rust-lang/log/pull/555
• Put MSRV into Cargo.toml by @​est31 in https://github.com/rust-lang/log/pull/557

v0.4.18

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• fix markdown links (again) by @​hellow554 in https://github.com/rust-lang/log/pull/513
• add cargo doc to workflow by @​hellow554 in https://github.com/rust-lang/log/pull/515
• Apply Clippy lints by @​hellow554 in https://github.com/rust-lang/log/pull/516
• Replace ad-hoc eq_ignore_ascii_case with slice::eq_ignore_ascii_case by @​glandium in https://github.com/rust-lang/log/pull/519
• fix up windows targets by @​KodrAus in https://github.com/rust-lang/log/pull/528
• typo fix by @​jiangying000 in https://github.com/rust-lang/log/pull/529
• Remove dependency on cfg_if by @​EriKWDev in https://github.com/rust-lang/log/pull/536
• GitHub Workflows security hardening by @​sashashura in https://github.com/rust-lang/log/pull/538
• Fix build status badge by @​atouchet in https://github.com/rust-lang/log/pull/539
• Add call_logger to the documentation by @​a1ecbr0wn in https://github.com/rust-lang/log/pull/547
• Use stable internals for key-value API by @​KodrAus in https://github.com/rust-lang/log/pull/550
• Change wording of list of implementations by @​Thomasdezeeuw in https://github.com/rust-lang/log/pull/553
• Add std-logger to list of implementations by @​Thomasdezeeuw in https://github.com/rust-lang/log/pull/554
• Add set_max_level_racy and gate set_max_level by @​djkoloski in https://github.com/rust-lang/log/pull/544
• [doc] src/lib.rs : prefix an unused variable with an underscore by @​OccupyMars2025 in https://github.com/rust-lang/log/pull/561
• [doc] src/macros.rs : correct grammar errors of an example in lib documentation by @​OccupyMars2025 in https://github.com/rust-lang/log/pull/562

v0.4.17

• Update kv_unstable internal dependencies.

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