Update ui test suite to nightly-2023-03-24

Author: dtolnay

tests/ui/invalid-ident.stderr

@@ -6,7 +6,11 @@ error: expected identifier, found `0f`
 5 | | }
   | |_^ expected identifier
   |
-  = help: identifiers cannot start with a number
+help: identifiers cannot start with a number
+ --> tests/ui/invalid-ident.rs:3:1
+  |
+3 | paste! {
+  | ^
   = note: this error originates in the macro `paste` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: `"f\""` is not a valid identifier