chore(deps): update rust crate mdbook to v0.4.50

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mdbook	workspace.dependencies	patch	0.4.49 -> 0.4.50

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Release Notes

rust-lang/mdBook (mdbook)

v0.4.50

Compare Source

v0.4.49...v0.4.50

Added

• Added a keyboard shortcut help popup when pressing ?.
  #​2608

Changed

• Changed the look of the sidebar resize handle to match the new rustdoc format.
  #​2691
• / can now be used to open the search bar.
  #​2698
• Pressing enter from the search bar will navigate to the first entry.
  #​2698
• Updated opener to drop some dependencies.
  #​2709
• Updated dependencies, MSRV raised to 1.82.
  #​2711

Fixed

• Fixed uncaught exception when pressing down when there are no search results.
  #​2698
• Fixed syntax highlighting of Rust code in the ACE editor.
  #​2710

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