Update Rust crate num-bigint to v0.4.6

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
num-bigint	dependencies	patch	0.4.3 → 0.4.6

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Release Notes

rust-num/num-bigint (num-bigint)

v0.4.6

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• Fixed compilation on x86_64-unknown-linux-gnux32.

Contributors: @​cuviper, @​ralphtandetzky, @​yhx-12243

v0.4.5

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• Upgrade to 2021 edition, MSRV 1.60
• Add const ZERO and implement num_traits::ConstZero
• Add modinv methods for the modular inverse
• Optimize multiplication with imbalanced operands
• Optimize scalar division on x86 and x86-64

Contributors: @​cuviper, @​joelonsql, @​waywardmonkeys

v0.4.4

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• Implemented From<bool> for BigInt and BigUint.
• Implemented num_traits::Euclid and CheckedEuclid for BigInt and BigUint.
• Implemented ties-to-even for BigInt and BigUint::to_f32 and to_f64.
• Implemented num_traits::FromBytes and ToBytes for BigInt and BigUint.
• Limited pre-allocation from serde size hints against potential OOM.
• Miscellaneous other code cleanups and maintenance tasks.

Contributors: @​AaronKutch, @​archseer, @​cuviper, @​dramforever, @​icecream17,
@​icedrocket, @​janmarthedal, @​jaybosamiya, @​OliveIsAWord, @​PatrickNorton,
@​smoelius, @​waywardmonkeys

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