Add 7-day cooldown for dependency resolution via uv exclude-newer

[Kludex]

Summary

• Adds exclude-newer = "7 days" to [tool.uv] in pyproject.toml.
• Mirrors a dependabot-style 7-day cooldown: uv skips package versions uploaded within the last 7 days when resolving dependencies, giving freshly released versions time to shake out before they land here.
• uv supports relative durations directly for this setting.

Ref: https://docs.astral.sh/uv/reference/settings/#exclude-newer

Test plan

• uv lock resolves successfully with the new setting.
• CI passes.

AI Disclaimer

This PR was developed with the assistance of either Claude or Codex. I've reviewed and verified the changes.

[codspeed-hq]

Merging this PR will not alter performance

✅ 24 untouched benchmarks

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_{Comparing uv-exclude-newer-cooldown (27a813a) with main (767315b)}

[github-actions]

📖 Docs preview: https://909ebe48.uvicorn.pages.dev

[chatgpt-codex-connector]

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