Doesn't work with blender 3.4?

[joevenzon]

I was getting an error message with Blender 3.4, so I modified the script in this fork:
https://github.com/joevenzon/VertexAlphaSetter

I didn't initiate a pull request because I have no idea what I'm doing, but the script works for me and so I wanted to at least let someone know.