[isort] Permit to use isort 6

[Pierre-Sassoulas]

Type of Changes

	Type
✓	🐛 Bug fix

Description

It's arguable it's not a bug fix, but I don't want to have to release pylint 4.0 for this (it's definitely not ready).

Closes #10203

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.84%. Comparing base (2eba0bd) to head (2b23194).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10204   +/-   ##
=======================================
  Coverage   95.84%   95.84%           
=======================================
  Files         175      175           
  Lines       19056    19056           
=======================================
  Hits        18264    18264           
  Misses        792      792           

[DanielNoord]

Thanks Pierre!

[github-actions]

The backport to maintenance/3.3.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-maintenance/3.3.x maintenance/3.3.x
# Navigate to the new working tree
cd .worktrees/backport-maintenance/3.3.x
# Create a new branch
git switch --create backport-10204-to-maintenance/3.3.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 aca073c55da59fad2bb3504ee25f5269ef4e42c9
# Push it to GitHub
git push --set-upstream origin backport-10204-to-maintenance/3.3.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-maintenance/3.3.x

Then, create a pull request where the base branch is maintenance/3.3.x and the compare/head branch is backport-10204-to-maintenance/3.3.x.