chore(deps): bump rug from 1.26.1 to 1.28.0

[dependabot]

Bumps rug from 1.26.1 to 1.28.0.

Changelog

Sourced from rug's changelog.

Version 1.28.0 (2025-08-21)

• The crate now requires rustc version 1.85.0 or later.
• The following methods were added to Float:
  • as_shl, as_shr
• The following methods were added to Complex:
  • as_shl, as_shr
• The experimental feature num-complex was added (issue 84).
• The experimental feature borsh was added (merge request 6).

Version 1.27.0 (2025-01-24)

• The [az crate], which is a dependency, is now re-exported ([issue 73]).
• The following methods were added to [Float][flo-1-27]:
  • [to_integer_in_place][flo-tiip-1-27], [to_integer_round_in_place][flo-tirip-1-27], [to_integer_exp_in_place][flo-tieip-1-27] ([issue 75])
  • [to_rational_in_place][flo-trip-1-27] ([issue 75])
  • [remainder_quo31][flo-rq-1-27], [remainder_quo31_mut][flo-rqm-1-27], [remainder_quo31_round][flo-rqr-1-27] ([issue 76])
  • [remainder_quo31_from][flo-rqf-1-27], [remainder_quo31_from_round][flo-rqfr-1-27]
  • [remainder_quo31_ref][flo-rqref-1-27]
  • [frexp][flo-f-1-27], [frexp_mut][flo-fm-1-27], [frexp_ref][flo-fr-1-27] ([issue 76])
• Bug fix: [Float][flo-1-27]::[to_f16][flo-tf16-1-27] and [Float][flo-1-27]::[to_f128][flo-tf128-1-27] were giving bad results for some subnormal numbers ([issue 80]).

Compatibility note

• These subnormalization methods for [Float][flo-1-27] now handle numbers with exponents smaller than subnormals by rounding them to either 0 or a subnormal with the minimum nonzero magnitude ([issue 78]):
  • [subnormalize_ieee][flo-si-1-27],

... (truncated)

Commits

• e4c3ddd version 1.28.0: fix doc typo
• 264f1f3 version 1.28.0: update features for docs, ci
• f585ec2 cargo fmt
• 8822d5a fix core::error::Error import
• c1cc335 version 1.28.0
• b8a2cd1 implement AssignRound<num_complex::Complex> for Complex
• de14640 implement {Assign,From}<num_complex::Complex> for MiniComplex
• 14c76af implement *Cast<num_complex::Complex> for Complex
• 46811e6 add Complex::{to_c*} methods for num-complex feature
• d91fdf4 add num-complex feature
• Additional commits viewable in compare view

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Marked as stale due to inactivity. This will be closed in 7 days if inactivity continues.