chore(deps): update dependency uv to ~=0.6.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
uv (source, changelog)	~=0.6.7 -> ~=0.6.8

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Release Notes

astral-sh/uv (uv)

v0.6.8

Compare Source

Enhancements

• Add support for enabling all groups by default with default-groups = "all" (#​12289)
• Add simpler --managed-python and --no-managed-python flags for toggling Python preferences (#​12246)

Performance

• Avoid allocations for default cache keys (#​12063)

Bug fixes

• Allow local version mismatches when validating lockfile (#​12285)
• Allow owned string when deserializing requires-python (#​12278)
• Make cache errors non-fatal in Planner::build (#​12281)

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