chore(deps): update ghcr.io/astral-sh/uv docker tag to v0.8.4

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/astral-sh/uv	stage	patch	0.8.3 -> 0.8.4

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Release Notes

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

v0.8.4

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Enhancements

• Improve styling of warning cause chains (#​14934)
• Extend wheel filtering to Android tags (#​14977)
• Perform wheel lockfile filtering based on platform and OS intersection (#​14976)
• Clarify messaging when a new resolution needs to be performed (#​14938)

Preview features

• Add support for extending package's build dependencies with extra-build-dependencies (#​14735)
• Split preview mode into separate feature flags (#​14823)

Configuration

• Add support for package specific exclude-newer dates via exclude-newer-package (#​14489)

Bug fixes

• Avoid invalidating lockfile when path or workspace dependencies define explicit indexes (#​14876)
• Copy entrypoints that have a shebang that differs in python vs python3 (#​14970)
• Fix incorrect file permissions in wheel packages (#​14930)
• Update validation for environments and required-environments in uv.toml (#​14905)

Documentation

• Show uv_build in projects documentation (#​14968)
• Add UV_ prefix to installer environment variables (#​14964)
• Un-hide uv from --build-backend options (#​14939)
• Update documentation for preview flags (#​14902)

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