Update Malachite to 0.14 for standalone example builds - #9118

Summary

• Update RustPython's workspace malachite-bigint, malachite-q, and malachite-base requirements from 0.13 to 0.14.
• Refresh the four Malachite lock entries and their required wide / safe_arch updates, without changing unrelated dependency versions.
• Keep the independently resolved example projects compatible with pymath 0.2.0, which currently selects Malachite 0.14 for its concrete BigInt API.

This addresses the Build example projects failure in main CI 38530143046. The root lockfile previously retained 0.13 while the standalone frozen-stdlib example resolved both 0.13 and 0.14, producing incompatible BigInt types. The examples continue resolving their own dependencies; no CI steps or checks are disabled.

Dependency review

The published 0.13 and 0.14 malachite-bigint wrapper sources are identical. The rational conversions used by RustPython also have unchanged source. The backend release does contain numerical implementation changes, including FFT multiplication and AVX2/FMA runtime dispatch; this is not claimed to be an implementation-identical upgrade. The new minimum requirements force wide 1.7.1 and safe_arch 1.2.0. Their MSRVs remain below RustPython's declared Rust 1.99 requirement.

Validation

Local Linux validation against baseline 28393e932d46ac4df4e55ff1e393d3f4dc231bac:

• cargo fmt --all -- --check, git diff --check, and normal configured commit hooks.
• Fresh independent lock resolution for both examples: each selects a single Malachite 0.14 family, including the pymath / RustPython boundary.
• cargo build --locked --manifest-path example_projects/barebone/Cargo.toml and the equivalent frozen_stdlib command: both pass. The barebone feature set emits existing VM unused-code warnings.
• Both resulting example executables exit 0 within individual 30-second limits.
• cargo check --locked -p rustpython-vm -p rustpython-stdlib: pass.
• cargo clippy --locked -p rustpython-common -p rustpython-vm -p rustpython-stdlib --lib: pass without warnings.
• cargo test --locked -p rustpython-common --lib --no-run, then the produced test executable with int::tests:: and float_ops:: filters: 4 + 7 pass, each filter under a 30-second limit. Existing assertions remain active and unchanged.

These are bounded local checks, not a full workspace/C-API/Python suite result. No large-FFT stress, performance, multi-CPU SIMD matrix, macOS, Windows, or WASM runtime validation is claimed. Full upstream CI is pending on the PR.

AI assistance

OpenAI Codex assisted with diagnosis, dependency updates, independent source review, and bounded local validation. The precise model version is not exposed by this runtime. No Python standard-library files or test assertions are modified.

Summary by CodeRabbit

• Chores
  • Updated the versions of three workspace dependencies.