[issue45173] Remove configparser deprecations

[Hugo van Kemenade]

Change by Hugo van Kemenade <hugovk+python at gmail.com>:


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pull_requests: +29131
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/30952

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45173>
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