chore(deps): update dependency astral-sh/uv to v0.9.21

[renovate]

This PR contains the following updates:

Package	Update	Change
astral-sh/uv	patch	0.9.18 → 0.9.21

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Release Notes

astral-sh/uv (astral-sh/uv)

v0.9.21

Compare Source

Released on 2025-12-30.

Bug fixes

• Fix regression where zstd distribution hashes were not considered valid (#​17265)

Documentation

• Fix a typo in the resolution documentation (#​17258)
• Fix a typo in python install --default documentation (#​9826)

v0.9.20

Compare Source

Released on 2025-12-29.

This is a re-release of 0.9.20, with internal crate versions incremented to enable publishing to crates.io.

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