Use tomllib from the standard library on Python 3.11

[hroncok]

The code would be slightly easier if we fell back to tomli, but I kept using toml as this code also targets EL 8.

See https://fedoraproject.org/wiki/Changes/DeprecatePythonToml

[hroncok]

FTR tomli is being added to epel8, so this could be made a bit simpler.

[hroncok]

https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2022-5e36342ad8

[abompard]

OK, do you want to rework it Miro?

[hroncok]

Done.

[codecov-commenter]

Codecov Report

Base: 88.53% // Head: 88.76% // Increases project coverage by +0.23% 🎉

Coverage data is based on head (5bfed20) compared to base (5195026).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 5bfed20 differs from pull request most recent head b9eb8b1. Consider uploading reports for the commit b9eb8b1 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #274      +/-   ##
===========================================
+ Coverage    88.53%   88.76%   +0.23%     
===========================================
  Files           14       13       -1     
  Lines         1186     1193       +7     
  Branches       173      174       +1     
===========================================
+ Hits          1050     1059       +9     
+ Misses         123      121       -2     
  Partials        13       13              

Flag	Coverage Δ
unittests	88.68% <100.00%> (+0.23%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
fedora_messaging/config.py	100.00% <100.00%> (ø)
fedora_messaging/__init__.py
fedora_messaging/message.py	94.91% <0.00%> (+0.22%)	⬆️

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[hroncok]

The mocks got unhappy, trying to fix that.

[hroncok]

This turned out to be more tedious than I anticipated. The tests are very unforgiving to slight implementation changes :(

Anyway, I think I cracked it and

$ tox -e=py3{6,7,8,9,10,11}-unittest

Passes.

Let me know if I shall squash or if you'd rather squash when merging. I'd like you to see my train of thought when reviewing it, so not squashing yet.

[abompard]

Let me know if I shall squash or if you'd rather squash when merging. I'd like you to see my train of thought when reviewing it, so not squashing yet.

Yeah, got it, thanks. Please squash. Sorry it ended up more painful that it should have been.

[hroncok]

Squashed, signed off.