feat(html): add inert global HTML attribute (#5476)

Add the `inert` boolean attribute to the global HTML attribute
group and to the SSR boolean attributes list. This allows users
to set `inert` on any HTML element, matching the HTML spec.

Fixes #5455

packages/html/src/attribute_groups.rs

@@ -301,6 +301,9 @@ mod_methods! {
     /// <https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/inputmode>
     inputmode;
 
+    /// <https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/inert>
+    inert;
+
     /// <https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/is>
     is;