fix(deps): update rust crate log to 0.4.20

This MR contains the following updates:

Package	Type	Update	Change
log	dependencies	patch	0.4.19 -> 0.4.20

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Release Notes

rust-lang/log (log)

v0.4.20

Compare Source

• 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

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