Fixed: MAC_M_SERIES enum not found

[robinjhuang]

Because Resolve_Gpu converts a string to a GPU_Option, we need to use the exact same string as upper and lowercase. gpu.uppper converts the previous mac_m_series into MAC_M_SERIES which was a non-existent GPU_OPTION.

@staticmethod
    def Resolve_Gpu(gpu: Union[GPU_OPTION, str, None]):
        if gpu is None:
            try:
                tver = metadata.version("torch")
                if "+cu" in tver:
                    return GPU_OPTION.NVIDIA
                elif "+rocm" in tver:
                    return GPU_OPTION.AMD
                else:
                    return None
            except metadata.PackageNotFoundError:
                return None
        elif isinstance(gpu, str):
            return GPU_OPTION[gpu.upper()]
        else:
            return gpu
            ```

[robinjhuang]

@telamonian Does gpu in uv.py class need to be a Union type of str and the GPU_OPTION enum? That's the root cause of this uncaught bug. What if we just make the gpu value typed as GPU_OPTION?

[telamonian]

@robinjhuang You make a good point. I think I made that change to make testing during development easier. I often import functions into a notebook cell to mess with them as I develop, eg:

from comfy_cli.uv import DependencyCompiler
dp = DependencyCompiler(gpu="amd", ...)

But there shouldn't be any need for it in the final product. Alright, let me make those changes and I'll add them to this PR