Update webui-macos-env.sh

[shinriyo]

fix for this

ERROR: Could not find a version that satisfies the requirement torch==2.3.1 (from versions: 1.11.0, 1.12.0, 1.12.1, 1.13.0, 1.13.1, 2.0.0, 2.0.1, 2.1.0, 2.1.1, 2.1.2, 2.2.0, 2.2.1, 2.2.2)
ERROR: No matching distribution found for torch==2.3.1
Traceback (most recent call last):
  File "/Users/shinriyo/development/stable-diffusion-webui/launch.py", line 48, in <module>
    main()
  File "/Users/shinriyo/development/stable-diffusion-webui/launch.py", line 39, in main
    prepare_environment()
  File "/Users/shinriyo/development/stable-diffusion-webui/modules/launch_utils.py", line 381, in prepare_environment
    run(f'"{python}" -m {torch_command}', "Installing torch and torchvision", "Couldn't install torch", live=True)
  File "/Users/shinriyo/development/stable-diffusion-webui/modules/launch_utils.py", line 116, in run
    raise RuntimeError("\n".join(error_bits))
RuntimeError: Couldn't install torch.
Command: "/Users/shinriyo/development/stable-diffusion-webui/venv/bin/python" -m pip install torch==2.3.1 torchvision==0.18.1
Error code: 1

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• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[w-e-w]

I think this section was done by accident?