Bump num-bigint from 0.4.0 to 0.4.3 in /rust

[dependabot[bot]]

Bumps num-bigint from 0.4.0 to 0.4.3.

Changelog

Sourced from num-bigint's changelog.

Release 0.4.3 (2021-11-02)

• GHSA-v935-pqmr-g8v9: Fix unexpected panics in multiplication.

Contributors: @​arvidn, @​cuviper, @​guidovranken

Release 0.4.2 (2021-09-03)

• Use explicit Integer::div_ceil to avoid the new unstable method.

Contributors: @​catenacyber, @​cuviper

Release 0.4.1 (2021-08-27)

• Fixed scalar divide-by-zero panics.
• Implemented DoubleEndedIterator for U32Digits and U64Digits.
• Optimized multiplication to avoid unnecessary allocations.
• Optimized string formatting for very large values.

Contributors: @​cuviper, @​PatrickNorton

Commits

• e77ffac Merge #228
• 056e0d4 Release 0.4.3
• 8008707 Fix an undersized buffer panic in multiplication
• 0940e50 Fix a mac3 panic when an operand is all-zero
• 1fc2537 Add 0.3.3 release notes
• 8ee0b9a Merge #219
• 1469ed6 Fix div_ceil with rand and serde too
• 22940ca Release 0.4.2
• de57106 Adjust shadowed names around div_ceil
• a8fc78c rust: use explicitily Integer::div_ceil
• Additional commits viewable in compare view

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