specify pillow version >= 9.0.0

the different version(such as 8.3.2 and 9.x) result in diff in eval top1 acc

requirements.txt

 prettytable
 ujson
 opencv-python<=4.6.0.66
-pillow
+pillow>=9.0.0
 tqdm
 PyYAML>=5.1
 visualdl>=2.2.0