Use ruff isort plugin instead of isort

[farmio]

Description

• Use ruff isort plugin instead of isort
• Move ruff to separate tox env (so dependabot updates can trigger a run - which doesn't work for update pre-commit hooks script)
• Run ruff in pre-commit only on pre-commit
• Remove isort from requirements
• Remove black target_version as it is now inferred from project.requires-python
• Only run tests for specified python version, only lint in one CI runner

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code quality improvements to existing code or addition of tests

Checklist

• The documentation has been adjusted accordingly
• Tests have been added that prove the fix is effective or that the feature works
• The changes are documented in the changelog (docs/changelog.md)

[codecov]

Codecov Report

Merging #1353 (544d0a0) into main (a51e2b4) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1353      +/-   ##
==========================================
+ Coverage   96.55%   96.56%   +0.01%     
==========================================
  Files         150      150              
  Lines        9584     9584              
==========================================
+ Hits         9254     9255       +1     
+ Misses        330      329       -1     

see 1 file with indirect coverage changes