Update dependency astral-sh/uv to v0.12.9

[renovate]

This PR contains the following updates:

Package	Update	Change
astral-sh/uv	patch	0.12.8 → 0.12.9

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Release Notes

astral-sh/uv (astral-sh/uv)

v0.12.9

Compare Source

Released on 2026-09-01.

Python

• Add CPython 3.15.0rc2 (#​21413, #​21415)

Enhancements

• Add --no-locked and --no-frozen to disable lock modes enabled by UV_LOCKED and UV_FROZEN for a single invocation (#​21408)
• Report the exact command-line lock-mode flag in warnings and errors (#​21402)

Performance

• Speed up cold wheel installs by extracting each streaming ZIP archive in a single blocking task and reusing buffers across files (#​21372)

Bug fixes

• Update async_http_range_reader to 0.11.1 to address a potential memory-safety issue when reading metadata ranges from untrusted wheels (#​21401)
• Remove sensitive headers when redirects cross authentication realms, including same-host redirects that change URL schemes (#​21382)
• Redact secrets in signed URLs from retry diagnostics, including nested request errors (#​21381)
• Give --locked, --frozen, --check, and --check-exists precedence over conflicting UV_LOCKED and UV_FROZEN values (#​21396)
• Prevent concurrent uv processes from redundantly extracting the same local or source-built wheel (#​21400)

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