[Backgammon] Fix deprecated a_min and a_max (#1201)

pgx/backgammon.py

@@ -349,7 +349,7 @@ def _is_all_on_home_board(board: Array):
  One can bear off if all checkers are on home board.
  """
  home_board: Array = _home_board()
- on_home_board = jnp.clip(board[home_board], a_min=0, a_max=15).sum()
+ on_home_board = jnp.clip(board[home_board], min=0, max=15).sum()
  off = board[_off_idx()] # type: ignore
  return (15 - off) == on_home_board