I think you are correct, it seems like it is missing requirements to boto/azure/google (I will make sure this is added). In the meantime, you can stop the "triton serving engine" Task, reset it, add boto3 to the installed packages and relaunch.
That said your main issue might be packaging the python model. Basically you need to create a model from the entire folder (with whatever there is inside the folder), then Triton should be able to run it (if the config.pbtxt is correct).
m = OutputModel() m.update_weights_package(weights_path='path/goes/here/')