chore(deps): update dependency uv to ~=0.6.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
uv (source, changelog)	~=0.6.8 -> ~=0.6.9

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Release Notes

astral-sh/uv (uv)

v0.6.9

Compare Source

Enhancements

• Use keyring --mode creds when authenticate = "always" (#​12316)
• Fail with specific error message when no password is present and authenticate = "always" (#​12313)

Bug fixes

• Add boolish value parser for UV_MANAGED_PYTHON flags (#​12345)
• Make deserialization non-fatal when assessing source tree revisions (#​12319)
• Use resolver-returned wheel over alternate cached wheel (#​12301)

Documentation

• Add experimental --torch-backend to the PyTorch guide (#​12317)
• Fix #keyring-provider references in alternative index docs (#​12315)
• Fix --directory path in examples (#​12165)

Preview changes

• Automatically infer the PyTorch index via --torch-backend=auto (#​12070)

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