chore(deps): Bump shakmaty from 0.21.0 to 0.21.3

[dependabot[bot]]

Bumps shakmaty from 0.21.0 to 0.21.3.

Changelog

Sourced from shakmaty's changelog.

v0.21.3

• Optimize Position::outcome().
• Detect Antichess insufficient material with only two knights.
• Fix off-backrank king influencing invalid castling notation in FEN.

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

• 5f2aca4 prepare 0.21.3
• 845000b ignore moved kind in fmt_castling
• 6c871b6 add chessops fail to fen corpus
• 5b825f7 some position methods considered final
• a9f677f code golf
• 1840f1a Merge pull request #59 from kraktus/optimise_outcome
• 7c37cf2 antichess insufficient material with two knights
• 6d8410c Optimise Position::outcome
• e9d06a5 Check for variant ending early for Position::is_variant_end
• 88a1758 remove statement about fen roundtrips
• Additional commits viewable in compare view

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Superseded by #131.