Fixing pyproject.toml

pyproject.toml

@@ -57,7 +57,7 @@ isa = [
 ]
 
 # shared ML dependencies
-ml = ["torch==2.0.1", "torchvision==0.15.2", "beartype==0.15.0", huggingface_hub]
+ml = ["torch==2.0.1", "torchvision==0.15.2", "beartype==0.15.0", "huggingface_hub"]
 
 # Im2MML dependencies. The img2mml service converts equation images to MathML.
 # See the skema/img2mml directory.