Fix CI

Author: daxpedda

taplo.toml

@@ -1,5 +1,5 @@
 [formatting]
+allowed_blank_lines = 1
 column_width = 100
 indent_string = '	'
 reorder_keys = true
-allowed_blank_lines = 1

tests/ui/union.stderr

@@ -18,3 +18,7 @@ note: required by a bound in `__AssertCopy`
 10 | #[derive_where(Clone)]
    | ^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `__AssertCopy`
    = note: this error originates in the derive macro `::derive_where::DeriveWhere` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider annotating `MissingCopy<T>` with `#[derive(Copy)]`
+   |
+11 | #[derive(Copy)]
+   |