Update imath 3.1.10 to latest versions on Windows.

[TodicaIonut]

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PR Description

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

• 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?

Upgrade OpenEXR 3.2.1 (libdeflate not found), OpenImageIO v2.5.8

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

Created a Windows release build with these new library versions and it appears to work fine.