Comment protobuf in requirements.txt (#9207)

The low package version is causing conflicts among other dependencies, commenting it causes no ill effects in CI so this should be fine.

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

requirements.txt

@@ -12,7 +12,7 @@ scipy>=1.4.1
 torch>=1.7.0
 torchvision>=0.8.1
 tqdm>=4.64.0
-protobuf<=3.20.1  # https://github.com/ultralytics/yolov5/issues/8012
+# protobuf<=3.20.1  # https://github.com/ultralytics/yolov5/issues/8012
 
 # Logging -------------------------------------
 tensorboard>=2.4.1