fix: Todo list items not showing as checked on Firefox

shared/editor/nodes/CheckboxItem.ts

@@ -36,7 +36,7 @@ export default class CheckboxItem extends Node {
         const input = document.createElement("span");
         input.tabIndex = -1;
         input.className = "checkbox";
-        input.ariaChecked = node.attrs.checked.toString();
+        input.setAttribute("aria-checked", node.attrs.checked.toString());
         input.setAttribute("role", "checkbox");
         input.addEventListener("click", this.handleClick);
 
@@ -75,7 +75,7 @@ export default class CheckboxItem extends Node {
 
     if (result) {
       const transaction = tr.setNodeMarkup(result.inside, undefined, {
-        checked: event.target.ariaChecked !== "true",
+        checked: event.target.getAttribute("aria-checked") !== "true",
       });
       view.dispatch(transaction);
     }