chore(deps): update ghcr.io/astral-sh/uv docker tag to v0.12.15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/astral-sh/uv	final	patch	0.12.14 → 0.12.15

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Release Notes

astral-sh/uv (ghcr.io/astral-sh/uv)

v0.12.15

Compare Source

Released on 2026-09-15.

This release fixes a regression in 0.12.14 that lead to rejecting valid installation commands such as using
uv pip install --system in python:* docker images or when using uv pip install --target .. (#​21699)

Performance

• Speed up cold-cache resolution and HTTP cache revalidation by batching cache writes (#​21675)

Bug fixes

• Revert "Reject symlinked wheel installation destinations" (#​21699)

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