chore(deps): update web-sys requirement from =0.3.70 to =0.3.99

[dependabot]

Updates the requirements on web-sys to permit the latest version.

Changelog

Sourced from web-sys's changelog.

wasm-bindgen Change Log

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Unreleased

Added

• Added the maxAge attribute to the CookieInit dictionary in web-sys, matching the current Cookie Store API specification. #5169

• The js-sys futures codegen opt-in can now also be enabled via the WASM_BINDGEN_USE_JS_SYS=1 environment variable, in addition to --cfg=wasm_bindgen_use_js_sys. This works on stable when --target is in use, where Cargo does not propagate the cfg to host proc-macros. #5164

Changed

• JsOption<T> now treats only undefined as empty, aligning it with TypeScript's strict T | undefined semantics and with Option<T>'s wire shape (None ↔ undefined). Previously is_empty, as_option, into_option, unwrap, expect, unwrap_or_default, and unwrap_or_else treated both null and undefined as absent; JS null is now a distinct present value. The impl<T> UpcastFrom<Null> for JsOption<T> is removed (Undefined still models absence), and the Debug/Display absent placeholder changed from "null" to "undefined". Code relying on null → None should return undefined from the JS side, or check explicitly with val.as_option().filter(|v| !v.is_null()). #5170

Fixed

• Fixed a panic ("Unhandled load width 8") in the descriptor interpreter when processing -Cinstrument-coverage-instrumented modules, unblocking cargo llvm-cov --target wasm32-unknown-unknown for crates whose describe helpers get instrumented. #5179

Removed

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0.2.122

Notices

• Threading support now requires -Clink-arg=--export=__heap_base to be set in RUSTFLAGS for nightly toolchains from 2026-05-06 onward, after

... (truncated)

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