Upgrading black to 22.3.0, editing code accordingly

[vallis]

CI fails otherwise because black is incompatible with package click. The new black wants to make a few style changes, but they all seem reasonable or positive.

[codecov[bot]]

Codecov Report

Merging #318 (46df56f) into master (2df96c2) will increase coverage by 0.10%. The diff coverage is 85.18%.

@@            Coverage Diff             @@
##           master     #318      +/-   ##
==========================================
+ Coverage   87.94%   88.05%   +0.10%     
==========================================
  Files          13       13              
  Lines        2978     2980       +2     
==========================================
+ Hits         2619     2624       +5     
+ Misses        359      356       -3     

Impacted Files	Coverage Δ
enterprise/signals/signal_base.py	90.11% <33.33%> (-0.11%)	:arrow_down:
enterprise/signals/gp_priors.py	89.23% <80.00%> (ø)
enterprise/signals/utils.py	86.45% <83.33%> (ø)
enterprise/constants.py	100.00% <100.00%> (ø)
enterprise/signals/gp_bases.py	86.66% <100.00%> (ø)
enterprise/signals/gp_signals.py	90.30% <100.00%> (ø)
enterprise/signals/parameter.py	80.24% <100.00%> (+1.61%)	:arrow_up:
enterprise/signals/white_signals.py	98.47% <100.00%> (ø)

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[vallis]

Hmm... it seems the python-3.6 test failure is due to PINT. Will watch for a resolution there, or we could just drop 3.6.

[vallis]

Dropping Python 3.6 to sidestep a PINT bug. 3.6 is EOLed and deprecated anyway.