Deprecate Python 3.6.

[tobiasraabe]

Closes #165.

Follow some tips in https://www.youtube.com/watch?v=Oun5kXqENMk.

[codecov]

Codecov Report

Merging #192 (d7bb656) into main (95b0089) will increase coverage by 0.17%.
The diff coverage is 98.34%.

@@            Coverage Diff             @@
##             main     #192      +/-   ##
==========================================
+ Coverage   92.78%   92.95%   +0.17%     
==========================================
  Files          75       75              
  Lines        6872     6830      -42     
==========================================
- Hits         6376     6349      -27     
+ Misses        496      481      -15     

Flag	Coverage Δ
end_to_end	78.71% <97.52%> (+0.08%)	⬆️
integration	41.85% <92.97%> (-0.08%)	⬇️
unit	70.07% <95.86%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
src/_pytask/cli.py	98.63% <66.66%> (ø)
src/_pytask/clean.py	90.57% <85.71%> (-0.33%)	⬇️
src/_pytask/debugging.py	32.37% <88.88%> (-1.10%)	⬇️
src/_pytask/profile.py	86.44% <92.30%> (-0.38%)	⬇️
src/_pytask/__init__.py	66.66% <100.00%> (+6.66%)	⬆️
src/_pytask/build.py	88.70% <100.00%> (ø)
src/_pytask/capture.py	88.69% <100.00%> (+2.88%)	⬆️
src/_pytask/collect.py	94.40% <100.00%> (-0.11%)	⬇️
src/_pytask/collect_command.py	87.50% <100.00%> (-0.22%)	⬇️
src/_pytask/compat.py	96.36% <100.00%> (-0.07%)	⬇️
... and 65 more

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