chore(deps): Bump shakmaty from 0.21.0 to 0.21.2

[dependabot[bot]]

Bumps shakmaty from 0.21.0 to 0.21.2.

Changelog

Sourced from shakmaty's changelog.

v0.21.2

• Fix castling rights without matching rooks failing FEN/EPD parser roundtrip.
• Fix pawn moves like P6h8 failing SAN parser roundtrip.
• More precisely document FEN/EPD parser and writer.
• More strictly validate pawns on backrank in Horde.
• More strictly validate impossible material in RacingKings.
• Add {Rank,File}::distance().
• Implement Copy for ByRole and ByColor when possible.
• Constify most Bitboard functions.

v0.21.1

• Rename Castles::discard_side() to discard_color() and Castles::has_side() to has_color().
• Add Bitboard::without_first().
• Add Bitboard::shift().
• Add {Fen,Epd}::from_setup() and {Fen,Epd}::as_setup().
• Implement Clone for PositionError when possible.

Commits

• 723eda2 prepare 0.21.2
• 4d72e10 add roundtrip to uci fuzz test
• d678d07 test and fix san roundtrip
• c39217c add roundtrip to square fuzz test
• a0f6a08 guarantee and fix fen and epd roundtrip equality
• 8c43c36 make Castles docs more precise
• db2dfdc readme: SANs -> SAN, FENs -> FEN
• 6142496 constify most Bitboard functions (closes #56)
• f6b3b22 validate RacingKings material
• 90a5b9f add crazyhouse perft involving promoted pieces
• Additional commits viewable in compare view

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Superseded by #122.