Finish up on Python 3.12 support

[hartwork]

Follow-up to #754

[jairhenrique]

@hartwork can you rebase with master!?

[hartwork]

@hartwork can you rebase with master!?

@jairhenrique sure, but it had little chance of working (with regard to red CI) last time, hence the draft. Rebased and pushed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (604c0be) 90.10% compared to head (954a100) 90.10%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #775   +/-   ##
=======================================
  Coverage   90.10%   90.10%           
=======================================
  Files          27       27           
  Lines        1809     1809           
  Branches      335      335           
=======================================
  Hits         1630     1630           
  Misses        134      134           
  Partials       45       45           

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[hartwork]

@jairhenrique I have re-run the pypy3.10 CI 10 times now without a single success. I believe it's time to declare that support broken and drop it in a dedicated pull request, coming up in a minute. The errors were:

a) with -m 'not online' (most of the time)

[..]
E           urllib3.exceptions.ProtocolError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))
[..]
=========================== short test summary info ============================
FAILED tests/integration/test_urllib3.py::test_post[https] - urllib3.exceptio...
=========== 1 failed, 249 passed, 9 skipped, 14 deselected in 22.59s ===========
[..]

b) with -m online (rarely)

[..]
E           requests.exceptions.ConnectionError: HTTPSConnectionPool(host='api.flickr.com', port=443): Max retries exceeded with url: /services/upload (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x00007fc8b1f54870>: Failed to establish a new connection: [Errno 101] Network is unreachable'))
[..]
=========================== short test summary info ============================
FAILED tests/integration/test_wild.py::test_flickr_should_respond_with_200 - ...[..]
===== 1 failed, 15 passed, 5 skipped, 293 deselected in 144.59s (0:02:24) ======
[..]

[hartwork]

@jairhenrique now that this is merged, I'll write an issue recommending a new release to unblock users' upgrade to Python 3.12. Will take a few minutes.