build(deps): bump log from 0.4.11 to 0.4.12

[dependabot-preview[bot]]

Bumps log from 0.4.11 to 0.4.12.

Changelog

Sourced from log's changelog.

[0.4.12] - 2020-12-24

New

• Support platforms without atomics by racing instead of failing to compile
• Implement Log for Box<T: Log>
• Update cfg-if to 1.0
• Internal reworks of the structured logging API. Removed the Fill API and added source::as_map and source::as_list to easily serialize a Source as either a map of {key: value, ..} or as a list of [(key, value), ..].

Fixed

• Fixed deserialization of LevelFilter to use their u64 index variants

Commits

• 746e6e2 Merge pull request #429 from KodrAus/cargo/0.4.12
• 4c66a1c prepare for 0.4.12 release
• 0e78c11 Run tests in our MSRV (#427)
• 03b6989 Merge pull request #422 from Aaron1011/fix/semi
• c4ed87c Merge pull request #426 from KodrAus/feat/kv-downcast
• 960ef82 add adapters for serializing Sources
• e999195 expose downcasting on Value
• 078e68f Merge pull request #423 from KodrAus/feat/value-bag
• 71d6ed3 add serde support to Value
• c6be245 simplify ToValue impl for str
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

A newer version of log exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.

[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.