MNT: change from using SafeConfigParser to ConfigParser

[tacaswell]

SafeConfigParser has been deprecated since Python 3.2 and will
be removed in py312.

python/cpython#28292
https://bugs.python.org/issue45173
python/cpython#89336

[GPUtester]

Can one of the admins verify this patch?

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

       15 files  ±0         15 suites  ±0   7h 18m 26s ⏱️ + 5m 43s
  2 879 tests ±0    2 762 ✔️  - 31    83 💤 ±0  29 ❌ +26  5 🔥 +5 
21 332 runs  +2  20 299 ✔️  - 63  962 💤  - 3  63 ❌ +60  8 🔥 +8 

For more details on these failures and errors, see this check.

Results for commit 01dc6df. ± Comparison against base commit 96c13a5.

♻️ This comment has been updated with latest results.

[quasiben]

ok to test

[quasiben]

Thanks @tacaswell . I see this was also done in python-versioneer/python-versioneer#207 . Merging in

[quasiben]

As a note, the failures in CI are unrelated to this PR

[tacaswell]

I know that versioneer has also fixed this upstream, however I decided to do the minimal fix rather an updating versioneer as I have semi-automated this process and have opened like 200 PRs with this change. It was my judgement that more projects would take the small fix more quickly than a full versioneer upgrade ;)