fix(configs): avoid weird ratios in config float parsing

[scarmuega]

Summary by CodeRabbit

• Chores
  • Updated dependencies and made related internal adjustments to maintain stability.

[rodrigosuaya]

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Full review triggered.

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Review failed

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Walkthrough

The PR upgrades the num-rational dependency from 0.4.1 to 0.4.2 and refactors Shelley configuration code to migrate from BigRational to Rational64 for float-to-rational conversions, simplifying rational number handling.

Changes

Cohort / File(s)	Change Summary
Dependency Update pallas-configs/Cargo.toml	Updated num-rational dependency from 0.4.1 to 0.4.2
BigRational to Rational64 Migration pallas-configs/src/shelley.rs	Replaced BigRational import with Rational64; changed float-to-rational conversion from BigRational::from_float(s) to Rational64::approximate_float(s); adjusted RationalNumber construction to directly convert Rational64 components to u64

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A rational hop, so neat and small,
No need for Big when Fixed works for all!
From Float to Sixty-Four, we bound and spring,
Our numbers dance—oh what joy they bring!
The update flows, efficient and light,
A simpler path makes the code just right! 🌟

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/ratio-parse

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 8a9d1dc and b9af222.

📒 Files selected for processing (2)

• pallas-configs/Cargo.toml (1 hunks)
• pallas-configs/src/shelley.rs (2 hunks)

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