script: Rename CanGc::note() to CanGc::deprecated_note() (#44081)

Per the suggestion in

https://servo.zulipchat.com/#narrow/channel/263398-general/topic/PSA.3A.20avoid.20new.20usages.20of.20CanGc.20whenever.20possible/near/583995807
to mark this method as deprecated and make clear it shouldn't be used
anymore, as alternatives exist.

Part of #40600

Testing: It compiles

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

components/script/dom/html/htmltextareaelement.rs

@@ -816,7 +816,7 @@ impl VirtualMethods for HTMLTextAreaElement {
         self.super_type().unwrap().pop();
 
         // https://html.spec.whatwg.org/multipage/#the-textarea-element:stack-of-open-elements
-        self.reset(CanGc::note());
+        self.reset(CanGc::deprecated_note());
     }
 }