Update ui test suite to nightly-2022-04-06

Author: dtolnay

tests/ui/not-quotable.stderr

@@ -4,4 +4,14 @@ error[E0277]: the trait bound `Ipv4Addr: ToTokens` is not satisfied
 6 |     let _ = quote! { #ip };
   |             ^^^^^^^^^^^^^^ the trait `ToTokens` is not implemented for `Ipv4Addr`
   |
+  = help: the following other types implement trait `ToTokens`:
+            &'a T
+            &'a mut T
+            Box<T>
+            Cow<'a, T>
+            Option<T>
+            Rc<T>
+            RepInterp<T>
+            String
+          and 23 others
   = note: this error originates in the macro `$crate::quote_token_with_context` (in Nightly builds, run with -Z macro-backtrace for more info)