Convert to use asyncio.get_running_loop

[coretl]

Also deprecate aioca.run so we don't need to change it

Fixes #60

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.34%. Comparing base (b04469b) to head (1f049d8).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #61   +/-   ##
=======================================
  Coverage   99.33%   99.34%           
=======================================
  Files           4        4           
  Lines         453      455    +2     
=======================================
+ Hits          450      452    +2     
  Misses          3        3           

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[AlexanderWells-diamond]

Looks fine to me, with the caveat that I think this is a major API change: If anyone was depending on aioca to make the event loop then the behaviour has changed.

Also requesting the added comment to refer to issue #62 .