Python 3.12 has dropped the `imp` module

[tomhughes]

Python 3.12 has dropped the imp module which is used at

autoprogram/sphinxcontrib/autoprogram.py

Line 149 in 9e7b723

import imp

meaning that this module now fails:

Exception occurred:
  File "/usr/lib/python3.12/site-packages/sphinxcontrib/autoprogram.py", line 148, in import_object
    import imp
ModuleNotFoundError: No module named 'imp'
The full traceback has been saved in /tmp/sphinx-err-qnsv37t_.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!