Bump log from 0.4.18 to 0.4.20

[dependabot[bot]]

Bumps log from 0.4.18 to 0.4.20.

Changelog

Sourced from log's changelog.

[0.4.20] - 2023-07-11

• Remove rustversion dev-dependency by @​Thomasdezeeuw in rust-lang/log#568
• Remove local_inner_macros usage by @​EFanZh in rust-lang/log#570

[0.4.19] - 2023-06-10

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

Commits

• 4708f14 Merge pull request #574 from chrysn-pull-requests/doc-log-to-defmt
• 6de3ccc Merge pull request #571 from rust-lang/cargo/0.4.20
• 838920c Merge pull request #575 from EFanZh/group-target-module-path-and-file
• 3985711 Group target, module_path and file arguments
• 3f534d0 Move private APIs into a single module
• f5ab686 doc: Add log-to-defmt to other-facilities section
• 6d173bf prepare for 0.4.20 release
• cab1088 Merge pull request #570 from EFanZh/remove-local-inner-macros
• 9d052b1 Remove local_inner_macros usage
• e9123d6 Merge pull request #568 from Thomasdezeeuw/remove-rustversion-dep
• Additional commits viewable in compare view

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Superseded by #288.