Update dependency uv to v0.12.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
uv (source, changelog)	0.12.20 → 0.12.21

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Release Notes

astral-sh/uv (uv)

v0.12.21

Compare Source

Released on 2026-09-29.

Python

• Update CPython to use OpenSSL 3.5.9 (#​22076)

Enhancements

• Omit empty [manifest] tables from lockfiles that contain only manifest subtables (#​22070)

Preview features

• Omit redundant runtime constraints from uv.lock, including those involving pre-releases, with the resolution-inputs preview feature (#​22004, #​22068)

Bug fixes

• Prevent uv python pin --rm from removing a global .python-versions file without --global (#​21992)
• Fix installed-package checks incorrectly reporting post-releases as incompatible with exclusive lower bounds on pre-releases (#​22049)

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