chore(deps): update dependency uv to ~=0.8.20

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This PR contains the following updates:

Package	Change	Age	Confidence
uv (source, changelog)	~=0.8.19 -> ~=0.8.20

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Release Notes

astral-sh/uv (uv)

v0.8.20

Compare Source

Released on 2025-09-22.

Enhancements

• Add --force flag for uv cache clean (#​15992)
• Improve resolution errors with proxied packages (#​15200)

Preview features

• Allow upgrading pre-release versions of the same minor Python version (#​15959)

Bug fixes

• Hide freethreaded+debug Python downloads in uv python list (#​15985)
• Retain the cache lock and temporary caches during uv run and uvx (#​15990)

Documentation

• Add package level conflicts to the conflicting dependencies docs (#​15963)
• Document pyodide support (#​15962)
• Document support for free-threaded and debug Python versions (#​15961)
• Expand the contribution docs on issue selection (#​15966)
• Tweak title for viewing version in project guide (#​15964)

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