chore(deps): update mozjs

- a8b688a: Add `ProxyTraps::{getPrototype, setPrototype, setImmutablePrototype}`

components/script/dom/bindings/codegen/CodegenRust.py

@@ -3477,6 +3477,9 @@ let traps = ProxyTraps {
     delete_: Some(%(delete)s),
     enumerate: None,
     getPrototypeIfOrdinary: Some(proxyhandler::get_prototype_if_ordinary),
+    getPrototype: None,
+    setPrototype: None,
+    setImmutablePrototype: None,
     preventExtensions: Some(proxyhandler::prevent_extensions),
     isExtensible: Some(proxyhandler::is_extensible),
     has: None,