fix: 📝 narrow requirements

The protobuf issue is only valid on windows as we must use the old
TF lib to get usable speeds for FILM interpolation. WSL, windows and mac don't need that trick.

Fixes #28

requirements.txt

@@ -8,7 +8,7 @@ tensorflow<2.11.0; platform_system == "Windows"
 tb-nightly==2.12.0a20230126; platform_system == "Windows"
 tensorflow; platform_system != "Windows"
 # the old tf version on windows comes with a breaking protobuf version
-protobuf==3.19.6
+protobuf==3.19.6; platform_system != "Windows"
 gdown @ git+https://github.com/melMass/gdown@main
 mmdet==3.0.0
 facexlib==0.3.0