Fixed error of getsize

[rabinandan]

Execution of the code gives the following error
File "/content/yolov9/utils/plots.py", line 300, in plot_images
annotator.box_label(box, label, color=color)
File "/content/yolov9/utils/plots.py", line 86, in box_label
w, h = self.font.getsize(label) # text width, height
AttributeError: 'FreeTypeFont' object has no attribute 'getsize'

Changes made

#Old code:
w, h = self.font.getsize(label)  # text width, height

#New code:
w, h = self.font.getbbox(label)[2:4]  # bounding box, get width and height

AND

# Old code
w, h = self.font.getsize(text)  # text width, height

#New code:
w, h = self.font.getbbox(text)[2:4]  # get bounding box, extract width and height