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539b8dd2e3
Update mdbook This updates mdbook from 0.4.20 to 0.4.21 Changelog: https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-0421 This contains a single fix that prevents mdbook from compiling on nightly (due to #99413). This will be necessary to keep everything working after the next master bootstrap switch.