Update maintainers in readme

[K-Meech]

This PR updates the list of maintainers in the README, to match the current maintainer team.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/datacarpentry/image-processing/compare/md-outputs..md-outputs-PR-344

The following changes were observed in the rendered markdown documents:

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⏱️ Updated at 2025-06-02 09:04:37 +0000

[uschille]

Thanks @K-Meech!