Update dependency uv to v0.12.21

[renovate]

This PR contains the following updates:

Package	Update	Change	Pending
uv	patch	0.12.18 → 0.12.21	0.12.22

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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)

v0.12.20

Compare Source

Released on 2026-09-28.

Enhancements

• Reuse lockfiles when dependency declarations are semantically equivalent (#​21951)
• Preserve second-line encoding declarations when installing wheel scripts with CRLF shebangs (#​21990)

Preview features

• Write normalized requirement declarations with the lockfile-normalization preview feature (#​21951)
• Honor synthetic default groups when installing or syncing from pylock.toml (#​22003)
• Resolve local paths in exported pylock.toml files relative to the output file (#​22042)
• Install each package only once when repeated tool-install-locks requirements resolve to the same package (#​22000)
• Reuse lock-without-metadata lockfiles for conflicting groups with distinct base and extra requirement specifiers (#​22055)
• Use consistent root-package paths in uv workspace metadata and uv tree --format json output (#​22050)

Configuration

• Continue searching XDG_CONFIG_DIRS after empty entries (#​21987)

Performance

• Restore the previous HTTP cache-write scheduling while investigating severe cache-revalidation stalls on ext4 filesystems (#​22051)

Bug fixes

• Apply hash constraints to every repeated requirement under --require-hashes and --verify-hashes (#​21996)
• Allow metadata builds for first-party workspace projects under --no-build (#​21988)
• Honor project exclusion flags with --all-packages, including --no-install-project and --no-emit-project (#​21994)
• Restore pyproject.toml if uv upgrade fails or is interrupted (#​21983)
• Generate working Nushell activation scripts for relocatable virtual environments (#​21979)
• Prevent commands from running and changing state after displaying --show-settings (#​21989)
• Treat UTF-16 requirements files containing only a byte-order mark as empty (#​21991)
• Ignore unrecognized managed-Python implementation directories during uv python list and uv python upgrade instead of panicking (#​22033)
• Avoid panics and incorrect rewriting when managed Python sysconfig paths merely start with /install (#​22036)
• Report whitespace-only non-ASCII requirements as invalid instead of panicking (#​22035)
• Avoid a resolver panic when trace logging an always-false constraint (#​22034)

v0.12.19

Compare Source

Released on 2026-09-24.

Python

• Add PyPy 3.11.16 and 3.12.14 (#​21847)
• Update GraalPy 3.13.0 to build 25.4.4 (#​21847)

Enhancements

• Format upload URLs with backticks in uv publish errors (#​21934)

Preview features

• Run build-backend hooks with lazy imports on CPython 3.15 and later using the build-lazy-imports preview feature (#​21967)
• Omit unused resolution settings from uv.lock and ignore changes to them when checking lockfile freshness with the resolution-inputs preview feature (#​21913)

Bug fixes

• Preserve signed and encoded query parameters in direct-URL metadata to avoid reinstalling unchanged packages (#​21971)
• Recognize 1.0.0 as satisfying ===1 during installed-package checks, matching resolution (#​21931)
• Avoid collisions between Git checkout readiness markers and .ok files in dependencies (#​21891)
• Preserve always-false python_version markers when parsing their serialized form (#​21939)

Rust API

• Restore the public FlatDistributions export and its BTreeMap conversion for downstream resolvers (#​21965)

Documentation

• Make individual preview-feature reference entries linkable by name (#​21950)

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