release(0.16.4): dep bumps + doctest repairs

[joaquinbejar]

Summary

• Bump workspace dependencies: `rust_decimal` 1.40 → 1.41, `rayon` 1.11 → 1.12, `uuid` 1.19 → 1.23, `tokio` 1.43 → 1.52.
• Repair three doctests broken by the `NonZeroUsize` migration in 0.16.0:
  • `src/pricing/mod.rs`: `telegraph(&option, 1000, ..)` → `telegraph(&option, optionstratlib::nz!(1000), ..)`
  • `src/pricing/mod.rs`: `monte_carlo_option_pricing(&option, 2, 2)` → `monte_carlo_option_pricing(&option, nz!(2), nz!(2))`
  • `src/utils/others.rs` — `deterministic_rng` doctest uses `rand::RngExt` for `.random::()`.
• Cargo-fmt side-effects on `async_ohlcv` / `cliquet_example`.

Tag `v0.16.4`, GitHub release, `make publish` follow immediately after merge.

Test plan

• `cargo build --all-features` clean.
• `cargo clippy --all-targets --all-features -- -D warnings` clean.
• `cargo fmt --all --check`.
• `cargo test --lib --all-features` — 3760 passed, 0 failed.
• `cargo test --doc --all-features` — 205 passed, 0 failed (was 3 failed pre-bump).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/utils/others.rs	100.00% <ø> (ø)

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