fix(VMenu): allow enter keypress to work in textareas

Previously, when a `<v-menu />` with `:close-on-content-click="false"`
contained a textarea, an enter press inside the textarea would do
nothing and not produce a new line. Now, it will allow a new line to be
typed into the textarea when pressing enter.

This last worked in Vuetify v3.5.14 and was broken starting in v3.5.15.
The fix for vuetifyjs#19519 in 85ba4a8 caused this issue.

fixes vuetifyjs#19767

packages/vuetify/src/components/VMenu/VMenu.tsx

@@ -126,6 +126,7 @@ export const VMenu = genericComponent<OverlaySlots>()({
       if (props.disabled) return
 
       if (e.key === 'Tab' || (e.key === 'Enter' && !props.closeOnContentClick)) {
+        if (e.key === 'Enter' && e.target instanceof HTMLTextAreaElement) return
         if (e.key === 'Enter') e.preventDefault()
 
         const nextElement = getNextElement(