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Ubuntu 20.04 is deprecated by ReadTheDocs and will stop working after June 1, 2026. Update to Ubuntu 24.04 and bump Python from 3.10 to 3.13. Fixes #693
imghdr was removed in Python 3.13, which breaks Sphinx 5.x. Update Sphinx and related packages to versions that support Python 3.13. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
ubuntu-20.04toubuntu-24.04(ubuntu-20.04 is deprecated after June 1, 2026)imghdrwas removed in Python 3.13, breaking Sphinx 5.x)Fixes #693
See: https://docs.readthedocs.io/en/stable/config-file/v2.html#build-os