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/shadowroot.rs

@@ -454,7 +454,7 @@ impl ShadowRootMethods<crate::DomTypeHolder> for ShadowRoot {
             StyleSheetList::new(
                 &self.window,
                 StyleSheetListOwner::ShadowRoot(Dom::from_ref(self)),
-                CanGc::note(),
+                CanGc::deprecated_note(),
             )
         })
     }