Auto merge of #125443 - nnethercote:rustfmt-use-decls, r=lcnr,cuviper,GuillaumeGomez

rustfmt `use` declarations

This PR implements https://github.com/rust-lang/compiler-team/issues/750, which changes how `use` declarations are formatted by adding these options to `rustfmt.toml`:
```
group_imports = "StdExternalCrate"
imports_granularity = "Module"
```

r? `@ghost`

1 files changed, 2 insertions, 2 deletions

diff --git a/library/alloc/src/sync/tests.rs b/library/alloc/src/sync/tests.rs
index 1b123aa58f2..d6b3de87577 100644
--- a/library/alloc/src/sync/tests.rs
+++ b/library/alloc/src/sync/tests.rs
@@ -1,5 +1,3 @@
-use super::*;
-
 use std::clone::Clone;
 use std::mem::MaybeUninit;
 use std::option::Option::None;
@@ -9,6 +7,8 @@ use std::sync::mpsc::channel;
 use std::sync::Mutex;
 use std::thread;
 
+use super::*;
+
 struct Canary(*mut AtomicUsize);
 
 impl Drop for Canary {