Bump mdbook from 0.4.26 to 0.4.27

[dependabot[bot]]

Bumps mdbook from 0.4.26 to 0.4.27.

Release notes

Sourced from mdbook's releases.

v0.4.27

See https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-0427 for a complete list of changes.

Changelog

Sourced from mdbook's changelog.

mdBook 0.4.27

v0.4.26...v0.4.27

Changed

• Reverted the dependency update to the toml crate. This was an unintentional breaking change in 0.4.26. #2021

Commits

• 7c4562a Merge pull request #2023 from ehuss/bump-version
• 6e3176f Update to 0.4.27
• 958b456 Also make sure releases use --locked
• a43b5b6 Merge pull request #2022 from ehuss/ci-locked
• 1517435 Merge pull request #2021 from rust-lang/revert-2009-deps/toml
• 7abb28c Make sure CI runs with --locked
• 112fd4a Merge pull request #2020 from mgeisler/patch-1
• 90fbe11 Revert "bump 'toml' dependency"
• c150529 Remove spammy debug! log from path_to_root
• See full diff in compare view

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[dependabot[bot]]

Looks like mdbook is up-to-date now, so this is no longer needed.