Fix MinGW opencolorio package and python zip creation

[acolwell]

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• [x] I've followed the contributing guidelines to the best of my understanding
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PR Description

What type of PR is this? (Check one of the boxes below)

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Improvement (non-breaking change which does not add functionality nor fixes a bug but improves Natron in some way)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] My change requires a change to the documentation
  • [ ] I have updated the documentation accordingly

What does this pull request do?

This change fixes the MinGW opencolorio package build and fixes the installer python zip script to work with python 3.11.

Have you tested your changes (if applicable)? If so, how?

Yes. Built the MinGW packages and installer locally and via GitHub actions.