update build process for python>=3.8

[mchasse]

These changes were done with Claude Code.
Upgrade to PyO3 0.22, adblock-rust 0.8, and abi3 wheel (Path B)

• Cargo.toml: Bump version to 0.6.0; upgrade PyO3 from 0.16.5 to 0.22; upgrade adblock from 0.5 to 0.8
• Cargo.toml: Add transitive pin rmp = ">=0.8, <0.8.15" to guard against a semver-breaking change in rmp 0.8.15 that breaks adblock's transitive dep rmp-serde 0.15.5 — necessary because Cargo.lock is gitignored for this library
• src/lib.rs: Replace Engine::from_rules with FilterSet::new + FilterSet::add_filters + Engine::from_filter_set, matching the adblock 0.8 API
• src/lib.rs: Replace removed Engine::check_network_urls with check_network_request(&Request), building a Request via Request::new (returns Result) and treating parse errors as "not blocked" to preserve prior behavior
• src/lib.rs: Update #[pymodule] signature from (_py: Python, m: &PyModule) to (m: &Bound<'_, PyModule>) per PyO3 0.20+ requirements
• src/lib.rs: Simplify check_network_urls return type from PyResult<bool> to bool — the method is now infallible; also clears a clippy useless_conversion warning
• pyproject.toml: Bump version to 0.6.0 to match Cargo.toml

[simonirwin-r7]

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