gpui: Update Menu name to use SharedString type to support more types (#14791)

Release Notes:

- N/A

crates/storybook/src/app_menus.rs

@@ -1,10 +1,10 @@
 use gpui::{Menu, MenuItem};
 
-pub fn app_menus() -> Vec<Menu<'static>> {
+pub fn app_menus() -> Vec<Menu> {
     use crate::actions::Quit;
 
     vec![Menu {
-        name: "Storybook",
+        name: "Storybook".into(),
         items: vec![MenuItem::action("Quit", Quit)],
     }]
 }