chore(deps): update dependency uv to v0.4.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
uv (source, changelog)	==0.4.20 -> ==0.4.21

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Release Notes

astral-sh/uv (uv)

v0.4.21

Compare Source

Enhancements

• Add support for managed installations of free-threaded Python (#​8100)
• Add note about uvx to uv tool run short help (#​7695)
• Enable HTTP/2 requests (#​8049)
• Support uv tree --no-dev (#​8109)
• Support PEP 723 metadata with uv run - (#​8111)
• Support pip install --exact (#​8044)
• Support uv export --no-header (#​8096)
• ADd Python 3.13 images to Docker publish (#​8105)
• Support remote (https://) scripts in uv run (#​6375)
• Allow comma value-delimited arguments in uv run --with (#​7909)

Configuration

• Support wildcards in UV_INSECURE_HOST (#​8052)

Performance

• Use shared index when fetching metadata in lock satisfaction routine (#​8147)

Bug fixes

• Add prerelease compatibility check to uv python CLI (#​8020)
• Avoid deleting a project environment directory if we cannot tell if a pyvenv.cfg file exists (#​8012)
• Avoid excluding valid wheels for exact requires-python bounds (#​8140)
• Bump netrc crate to latest commit (#​8021)
• Fix uv python pin 3.13t failure when parsing version for project requires check (#​8056)
• Fix handling of != intersections in requires-python (#​7897)
• Remove the newly created tool environment if sync failed (#​8038)
• Respect dynamic extras in uv lock and uv sync (#​8091)
• Treat resolver failures as fatal in lockfile validation (#​8083)
• Use git config --get for author information for improved backwards compatibility (#​8101)
• Use comma-separated values for UV_FIND_LINKS (#​8061)
• Use shared resolver state between add and lock to avoid double Git update (#​8146)
• Make --relocatable entrypoints robust to symlinking (#​8079)
• Improve compatibility with VSCode PS1 prompt (#​8006)
• Fix "Stream did not contain valid UTF-8" failures in Windows (#​8120)
• Use --with-requirements in uvx error hint (#​8112)

Documentation

• Include uvx installation in Docker examples (#​8179)
• Make the instructions for the Windows standalone installer consistent across README and documentation (#​8125)
• Update pip compatibility guide to note transitive URL dependency support (#​8081)
• Document --reinstall with --exclude-newer to ensure downgrades (#​6721)

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