fix(deps): update rust crate fraction to 0.15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
fraction (source)	dependencies	minor	0.14 -> 0.15

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Release Notes

dnsl48/fraction (fraction)

v0.15.0

Compare Source

Added

• GenericFraction try_from/try_into implementations for primitive types (u8, i8, u16, i16, u32, i32, u64, i64, u128, i128, usize, isize, f32, f64)
• GenericFraction try_from/try_into implementations for BigInt/BigUint ("with-bigint" feature)
• GenericDecimal try_from/try_into implementations for primitive types (u8, i8, u16, i16, u32, i32, u64, i64, u128, i128, usize, isize, f32, f64)
• GenericDecimal try_from/try_into implementations for BigInt/BigUint ("with-bigint" feature)
• Tests for all GenericDecimal ops (overloadable operators - std::ops)

Changed

• GenericDecimal ops (overloadable operators) refactoring. Each operator is now implemented separately in its own module, allowing decoupled code with its own optimisations and tests.

Fixed

• PartialOrd will now reuse Ord implementation where possible (refactor to make clippy happier)
• Fixed logic in sub_assign and checked_sub that could sometimes produce incorrect results for a couple of edge cases with a negative zero (-0) as an operand.

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