chore(deps): update dependency uv to v0.5.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
uv (source, changelog)	0.5.20 -> 0.5.21

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Release Notes

astral-sh/uv (uv)

v0.5.21

Compare Source

Enhancements

• Avoid building dynamic versions when validating lockfile (#​10703)

Configuration

• Add UV_VENV_SEED environment variable (#​10715)

Performance

• Store unsupported tags in wheel filename (#​10665)

Bug fixes

• Avoid attempting to patch macOS dylib for non-macOS installs (#​10721)
• Avoid narrowing requires-python marker with disjunctions (#​10704)
• Respect environment variable credentials for indexes outside root (#​10688)
• Respect preferences for explicit index dependencies from requirements.txt (#​10690)
• Sort preferences by environment, then index (#​10700)
• Ignore permission errors when looking for user-level configuration file (#​10697)

Documentation

• Add SyntaxWarning compatibility note to bytecode compilation docs (#​10701)
• Add MACOSX_DEPLOYMENT_TARGET to the --python-platform documentation (#​10698)

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