basicsr version update

There was a version class becasue of from torchvision.transforms_functional import rgb_to_grayscale
to from torchvision.transforms.functional import rgb_to_grayscale which in the lastest version have changed.

requirements.txt

@@ -1,4 +1,4 @@
-basicsr>=1.4.2
+basicsr>=1.3.3.5
 facexlib>=0.2.5
 lmdb
 numpy