bump isort action version

[fabianegli]

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #2001 (bc5e6f7) into dev (15b2066) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #2001   +/-   ##
=======================================
  Coverage   63.15%   63.15%           
=======================================
  Files          43       43           
  Lines        4951     4951           
=======================================
  Hits         3127     3127           
  Misses       1824     1824           

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