MAINT: Update ghcr.io/astral-sh/uv Docker tag to v0.9.21

[zon-renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/astral-sh/uv	final	patch	0.9.17 -> 0.9.21

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Release Notes

astral-sh/uv (ghcr.io/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

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.

v0.9.19

Released on 2025-12-29.

Python

• Add CPython 3.15.0a3 (#​17165)

Enhancements

• Allow uv pip compile to install missing python interpreters in cases where it would otherwise fail (#​17216)
• Avoid creating file contents with uv init --bare --script (#​17162)
• Respect --torch-backend in uv tool commands (#​17117)
• Support comma-separated values in --no-binary and --only-binary (#​17185)

Preview features

• Summarize package changes in uv sync with JSON output format (#​16981)

Performance

• Avoid two hot String allocations in deserialization (#​17221)
• Cache NVIDIA-hosted wheels by default (#​17164)

Bug fixes

• Avoid enforcing incorrect hash in mixed-hash settings (#​17157)
• Fix retry counts in cached client (#​17104)
• Respect UV_PYTHON_DOWNLOAD_MIRROR in uv python list (#​16673)
• Support remote pylock.toml files (#​17119)
• Avoid flagging proxied Git URLs as ambiguous authority (#​17234)
• Fix dropped support of - in pip constraints, overrides, and excludes (#​17188)

v0.9.18

Compare Source

Released on 2025-12-16.

Enhancements

• Add value hints to command line arguments to improve shell completion accuracy (#​17080)
• Improve error handling in uv publish (#​17096)
• Improve rendering of multiline error messages (#​17132)
• Support redirects in uv publish (#​17130)
• Include Docker images with the alpine version, e.g., python3.x-alpine3.23 (#​17100)

Configuration

• Accept --torch-backend in [tool.uv] (#​17116)

Performance

• Speed up uv cache size (#​17015)
• Initialize S3 signer once (#​17092)

Bug fixes

• Avoid panics due to reads on failed requests (#​17098)
• Enforce latest-version in @latest requests (#​17114)
• Explicitly set EntryType for file entries in tar (#​17043)
• Ignore pyproject.toml index username in lockfile comparison (#​16995)
• Relax error when using uv add with UV_GIT_LFS set (#​17127)
• Support file locks on ExFAT on macOS (#​17115)
• Change schema for exclude-newer into optional string (#​17121)

Documentation

• Drop arm musl caveat from Docker documentation (#​17111)
• Fix version reference in resolver example (#​17085)
• Better documentation for exclude-newer* (#​17079)

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