Support isort 7

[jas4711]

Compare last update for isort v6: #2289

I have verified that it builds and passes self-tests with v7 too.

[codspeed-hq]

CodSpeed Performance Report

Merging #2521 will not alter performance

_{Comparing jas4711:isortv7 (9a3b9ce) with main (2d9858f)}

Summary

✅ 32 untouched

[ilovelinux]

Could you please update the uv lock file with:

$ tox e -e lock -- uv lock

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.70%. Comparing base (2d9858f) to head (9a3b9ce).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2521   +/-   ##
=======================================
  Coverage   98.70%   98.70%           
=======================================
  Files          68       68           
  Lines        8402     8402           
  Branches      863      863           
=======================================
  Hits         8293     8293           
  Misses         76       76           
  Partials       33       33           

Flag	Coverage Δ
unittests	98.70% <100.00%> (ø)

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