Bump slotscheck from 0.20.1 to 0.21.0

[dependabot]

Bumps slotscheck from 0.20.1 to 0.21.0.

Release notes

Sourced from slotscheck's releases.

v0.21.0

• Add --pythonpath option to add directories to Python's import path. This is equivalent to setting $PYTHONPATH, but usable in places where environment variables are awkward to set (such as pre-commit on Windows).
• When a file isn't importable, the error message now suggests the directory to add to the import path, instead of only linking to the documentation.

Changelog

Sourced from slotscheck's changelog.

0.21.0 (2026-09-06)

• Add --pythonpath option to add directories to Python's import path. This is equivalent to setting $PYTHONPATH, but usable in places where environment variables are awkward to set (such as pre-commit on Windows).
• When a file isn't importable, the error message now suggests the directory to add to the import path, instead of only linking to the documentation.

Commits

• c30bb06 prepare release
• 129f7c1 fix fragile test
• e02c376 add help and CLI option for specifying pythonpath
• f56e8e6 Bump ruff from 0.16.4 to 0.16.5
• 5dcb4ce Bump sphinx-argparse from 0.6.0 to 0.6.1
• 4ebde0b Bump ruff from 0.16.3 to 0.16.4
• c7242db Bump astral-sh/setup-uv from 9.0.0 to 10.0.1
• bc214fc Bump ruff from 0.16.2 to 0.16.3
• df8268c Bump ruff from 0.16.1 to 0.16.2
• 4d0c116 Bump ruff from 0.16.0 to 0.16.1
• Additional commits viewable in compare view

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[codspeed]

Merging this PR will not alter performance

✅ 22 untouched benchmarks

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_{Comparing dependabot/pip/slotscheck-0.21.0 (27f9bc3) with master (3789716)}