getsize in PIL dosen't work anymore

in /ASCII-generator/utils.py at char_width, char_height = font.getsize("A") PIL says getsize is deprecated and will be replcaed in PIL 10, error message:

DeprecationWarning: getsize is deprecated and will be removed in Pillow 10 (2023-07-01). Use getbbox or getlength instead.
  char_width, char_height = font.getsize(sample_character)

how to replicate the error:

python3 img2img.py --language chinese

i don't understand PIL a lot and i couldn't find what getsize does so hopefully someone else can fix this.