build!: upgrade Rust crate num-modular to v0.6.5

[xtqqczze]

BREAKING CHANGE: remove the implicit num-bigint feature

Closes #126.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.11%. Comparing base (3f5db7d) to head (3d4b654).
⚠️ Report is 77 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   78.64%   86.11%   +7.47%     
==========================================
  Files          13       16       +3     
  Lines        2585     3933    +1348     
  Branches      230      265      +35     
==========================================
+ Hits         2033     3387    +1354     
+ Misses        552      544       -8     
- Partials        0        2       +2     

Flag	Coverage Δ
macos_latest	85.86% <ø> (+8.22%)	⬆️
ubuntu_latest	85.71% <ø> (+7.52%)	⬆️
windows_latest	15.40% <ø> (+0.70%)	⬆️

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[codspeed]

Merging this PR will regress 1 benchmark

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 5 improved benchmarks
❌ 1 regressed benchmark
✅ 18 untouched benchmarks
⏩ 9 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	three 39-bit primes (u128)	480.2 ms	1,352.9 ms	-64.51%
⚡	num-prime (this crate)	8.7 s	2.1 s	×4.1
⚡	num-prime (this crate)	8.6 ms	5.5 ms	+54.41%
⚡	num-prime (this crate)	5.8 ms	3.8 ms	+52.65%
⚡	num-prime (this crate)	19.3 ms	12.9 ms	+49.71%
⚡	a 35-bit prime to the 7th (246 bits)	630.9 µs	475.5 µs	+32.7%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing xtqqczze:GH126 (3d4b654) with main (866bc2c)}

Footnotes

1. 9 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩