Add pyupgrade UP rule to ruff

[larsevj]

See https://docs.astral.sh/ruff/rules/#pydocstyle-d

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.73913% with 26 lines in your changes missing coverage. Please review.

Project coverage is 91.94%. Comparing base (82972b0) to head (4bf6bc9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../tools/plot/customize/limits_customization_view.py	77.27%	5 Missing ⚠️
src/_ert/forward_model_runner/client.py	60.00%	4 Missing ⚠️
src/ert/gui/main.py	42.85%	4 Missing ⚠️
src/ert/storage/local_ensemble.py	88.23%	2 Missing ⚠️
src/ert/__main__.py	90.90%	1 Missing ⚠️
src/ert/ensemble_evaluator/_ensemble.py	75.00%	1 Missing ⚠️
src/ert/ensemble_evaluator/evaluator.py	87.50%	1 Missing ⚠️
src/ert/gui/simulation/view/update.py	75.00%	1 Missing ⚠️
...ert/gui/tools/plot/customize/customization_view.py	83.33%	1 Missing ⚠️
src/ert/gui/tools/plot/data_type_keys_widget.py	50.00%	1 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9499      +/-   ##
==========================================
+ Coverage   91.92%   91.94%   +0.01%     
==========================================
  Files         433      433              
  Lines       26734    26748      +14     
==========================================
+ Hits        24575    24593      +18     
+ Misses       2159     2155       -4     

Flag	Coverage Δ
cli-tests	39.41% <51.16%> (+0.03%)	⬆️
everest-models-test	34.70% <54.17%> (+0.01%)	⬆️
gui-tests	72.15% <85.41%> (+0.01%)	⬆️
integration-test	36.95% <55.21%> (+<0.01%)	⬆️
performance-tests	52.00% <80.44%> (+0.16%)	⬆️
test	40.62% <56.69%> (-0.02%)	⬇️
unit-tests	74.14% <90.52%> (+0.02%)	⬆️

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