Windows MINGW update ffmpeg, libraw, OpencolorIO.

[TodicaIonut]

Thanks for submitting a pull request! Please provide enough information so that others can review your pull request. Additionally, make sure you've done all of these things:

• [x] I've followed the contributing guidelines to the best of my understanding
• [x] I've read and understood the contributing guidelines
• [x] I've formatted my code according to Natron's code style
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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?

windows MINGW:

• ffmpeg 6.1.1
• libraw 0.21.2
• OpencolorIO 2.3.1
• OpenEXR 2.5 is no longer supported will get removed

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

Created a Windows release build with these new library versions

[rodlie]

Why did you add new packages? They also ignore custom build options/dependencies we have.