web-api-cat 0.7.3

Bindings between boa-cat (JS engine) and the DOM (html-cat tree) plus fetch (net-cat). v0.7.3 unlocks HTTPS in `fetch`: bumps net-cat from 0.1 to 0.3 with the `tls` feature enabled (rustls + webpki-roots + ring as the pure-Rust crypto provider, no C toolchain). `https://` URLs now flow through the same code path as `http://`, and net-cat 0.3's chunked-transfer decoding + cross-origin redirect Cookie/Authorization stripping come along for the ride. Seventh sub-crate of a Servo-replacement webview runtime targeting Tauri.