nflplotR 1.4.0

• Updated the New York Jets logo to their new design introduced in the 2024 off-season. (#62)
• Drop dependency to package rappdirs and create an optional user cache with base R's implementation. To support older R versions, nflplotR now imports the backports package. (#64)
• nflplotR v1.3.0 deprecated the functions scale_x_nfl, scale_y_nfl, scale_x_nfl_headshots, scale_y_nfl_headshots, theme_x_nfl, theme_y_nfl. They are completely removed from the source now. (#64)