Bump isort to 5.12.0 in pre-commit config

[TheJulianJES]

See PyCQA/isort#2077
Fixed by PyCQA/isort#2078 in isort 5.12.0

Will resolve the issue that #2146 runs into (when rebased)

[codecov-commenter]

Codecov Report

Base: 83.70% // Head: 83.70% // No change to project coverage 👍

Coverage data is based on head (2ab9d98) compared to base (07f38fc).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #2147   +/-   ##
=======================================
  Coverage   83.70%   83.70%           
=======================================
  Files         258      258           
  Lines        8228     8228           
=======================================
  Hits         6887     6887           
  Misses       1341     1341           

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[coveralls]

Pull Request Test Coverage Report for Build 4032834884

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 83.702%

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Totals
Change from base Build 4019454703:	0.0%
Covered Lines:	6887
Relevant Lines:	8228

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💛 - Coveralls