Replace getsize function with getbbox

Author: waynedyck

examples/ssd1306_pillow_demo.py

@@ -61,7 +61,8 @@
 
 # Draw Some Text
 text = "Hello World!"
-(font_width, font_height) = font.getsize(text)
+bbox = font.getbbox(text)
+(font_width, font_height) = bbox[2] - bbox[0], bbox[3] - bbox[1]
 draw.text(
     (oled.width // 2 - font_width // 2, oled.height // 2 - font_height // 2),
     text,