Add support for Python 3.12

[amotl]

About

Python 3.12 has been released recently. This patch attempts to add corresponding support.

Details

• For loading code at runtime, use importlib instead of imp.
  The imp module was deprecated and got removed from Python 3.12.
• Use importlib.resources instead of deprecated pkg_resources.
• Remove dependency on future package, for http and pushsafer service plugins.
• Upgrade to pyfakefs<6.
• Skip installing and testing twilio on Python 3.12.

Trivia

Start omitting intermediate Python versions on CI, to save resources.

[amotl]

aiohttp needs to be made compatible with Python 3.12. It is pulled in by the twilio package.

Failed to build aiohttp

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (ebad591) 49.54% compared to head (01f9a57) 49.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #685      +/-   ##
==========================================
+ Coverage   49.54%   49.75%   +0.20%     
==========================================
  Files          81       81              
  Lines        3996     4034      +38     
==========================================
+ Hits         1980     2007      +27     
- Misses       2016     2027      +11     

Flag	Coverage Δ
unittests	49.75% <80.68%> (+0.20%)	⬆️

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Files	Coverage Δ
mqttwarn/core.py	99.55% <100.00%> (+<0.01%)	⬆️
mqttwarn/services/amqp.py	100.00% <100.00%> (ø)
mqttwarn/util.py	98.10% <94.00%> (-1.90%)	⬇️
mqttwarn/services/pushsafer.py	97.24% <66.66%> (-2.76%)	⬇️
mqttwarn/services/http_urllib.py	13.97% <28.57%> (+0.34%)	⬆️

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