chore(deps): update ruff crates to v0.15.21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ruff_python_ast	workspace.dependencies	patch	0.15.20 → 0.15.21
ruff_python_parser	workspace.dependencies	patch	0.15.20 → 0.15.21
ruff_text_size	workspace.dependencies	patch	0.15.20 → 0.15.21

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Release Notes

astral-sh/ruff (ruff_python_ast)

v0.15.21

Compare Source

Released on 2026-07-09.

Preview features

• Add --add-ignore for adding ruff:ignore comments (#​26346)
• [flake8-comprehensions] Drop C409 tuple comprehension preview behavior (#​25707)
• Avoid whitespace normalization when formatting comments (#​26455)
• [pyupgrade] Lint and fix use of deprecated abc decorators (UP051) (#​26417)

Bug fixes

• Refine non-empty f-string detection (#​26526)
• Detect syntax errors in individual notebook cells (#​26419)
• [flake8-implicit-str-concat] Fix ISC003 autofix incorrectly stripping + from comments (#​26554)

Rule changes

• [flake8-executable] Mark EXE004 fix as unsafe (#​26033)
• [flake8-pyi] Mark PYI061 fixes as unsafe in Python files (#​26533)
• [pydocstyle] Skip overload-with-docstring in stub files (D418) (#​26318)

Performance

• Avoid per-token source index visitor calls (#​26506)
• Cache parenthesized expression boundaries in the formatter (#​26344)
• Improve performance of rendering edits in preview mode (#​26565)
• Inline fits_element in formatter (#​26429)
• Inline formatter printing hot paths (#​26504)
• Lazily create builtin bindings (#​26510)
• Skip empty trivia scans in the source indexer (#​26507)
• Use ICF for macOS release builds (#​25780)

Formatter

• Add --extend-exclude to ruff format (#​26372)

Documentation

• Add "How does Ruff's import sorting compare to isort?" link to README (#​26530)
• Fix Mozilla Firefox repository link in README (#​26537)
• [flake8-bandit] Fix misleading docstring for mako-templates (S702) (#​26432)
• [ruff] Fix non-triggering example for if-key-in-dict-del (RUF051) (#​26433)

Contributors

• @​EkriirkE
• @​tingerrr
• @​s-rigaud
• @​nikolauspschuetz
• @​Avasam
• @​ntBre
• @​omar-y-abdi
• @​AlexWaygood
• @​sylvestre
• @​shaanmajid
• @​lerebear
• @​baltasarblanco
• @​Sanjays2402
• @​ZedThree
• @​servusdei2018
• @​charliermarsh
• @​jesco-absolute
• @​velikodniy
• @​zaniebot
• @​epage

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.8%. Comparing base (b5cf692) to head (4af6d5b).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #376   +/-   ##
=====================================
  Coverage   93.8%   93.8%           
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  Files         96      96           
  Lines      15939   15939           
  Branches     118     118           
=====================================
  Hits       14958   14958           
  Misses       971     971           
  Partials      10      10           

Flag	Coverage Δ
3.11	93.8% <ø> (ø)
3.12	93.8% <ø> (ø)
3.13	93.8% <ø> (ø)
3.14	93.8% <ø> (ø)
macos-latest	93.8% <ø> (ø)
ubuntu-latest	93.8% <ø> (ø)
windows-latest	90.4% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
toolr-core	94.3% <ø> (ø)
toolr	92.8% <ø> (ø)
toolr-py	96.0% <ø> (ø)
xtask	90.3% <ø> (ø)