Update Black formatting (no spaces for power operator)

[EwoutH]

Black was updated to hug power operators, this commit fixes that in the Mesa code base.

Closes #1155.

[codecov]

Codecov Report

Merging #1160 (f45b042) into main (c30ab5e) will increase coverage by 0.25%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1160      +/-   ##
==========================================
+ Coverage   89.03%   89.28%   +0.25%     
==========================================
  Files          19       19              
  Lines        1258     1269      +11     
  Branches      254      259       +5     
==========================================
+ Hits         1120     1133      +13     
+ Misses        101      100       -1     
+ Partials       37       36       -1     

Impacted Files	Coverage Δ
mesa/space.py	94.92% <100.00%> (+0.01%)	⬆️
mesa/datacollection.py	97.70% <0.00%> (+0.02%)	⬆️
mesa/visualization/ModularVisualization.py	75.60% <0.00%> (+0.40%)	⬆️
mesa/main.py	96.42% <0.00%> (+0.42%)	⬆️
mesa/batchrunner.py	92.28% <0.00%> (+0.67%)	⬆️
mesa/visualization/UserParam.py	86.79% <0.00%> (+0.79%)	⬆️

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