Require imghdr for building Python 3.8-3.10 #267
Merged
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Python 3.8 & 3.9 use Sphinx 2.4.4, and Python 3.10 uses Sphinx 3.4.3. These require the
imghdr
module, which was removed in Python 3.13. The venvs now use Python 3.13, so we need to restore theimghdr
module for those versions.