chore(deps): update rust crate bigdecimal to v0.4.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
bigdecimal	workspace.dependencies	patch	0.4.5 -> 0.4.6

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Release Notes

akubera/bigdecimal-rs (bigdecimal)

v0.4.6

Compare Source

Changes

• Fix error in formatting code that would skip "carrying the one" when rounding up series of nines, overflowing

• Improved implementation of sqrt and cbrt

• Uses consistent rounding implementations in formatting and arithmetic operations

• Add new constructor methods BigDecimal::from_bigint & BigDecimal::from_biguint

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[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)