This PR updates mdbook version to 0.4.37 in CI.
This version is used at https://github.com/rust-lang/rust for release build.
Additionally #1847 requires over 0.4.30.
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This PR updates mdbook version to 0.4.37 in CI. This version is used at https://github.com/rust-lang/rust for release build. Additionally #1847 requires over 0.4.30.