Bump rustfmt style to 2024.

Needed to update the assembled libs because the formatting touched the asm
boilerplate.

Author: wt

cortex-m-rt/.rustfmt.toml

@@ -10,7 +10,7 @@ extern crate cortex_m_rt;
 extern crate panic_halt;
 
 use core::arch::asm;
-use cortex_m_rt::{entry, exception, ExceptionFrame};
+use cortex_m_rt::{ExceptionFrame, entry, exception};
 
 // This defines both `HardFault` and `_HardFault`. Both should have
 // link_section attributes placing them at the end of the .text section,

cortex-m-rt/examples/hard-fault-trampoline.rs

@@ -9,7 +9,7 @@ extern crate cortex_m_rt as rt;
 extern crate panic_halt;
 
 use cortex_m::asm;
-use rt::{entry, exception, ExceptionFrame};
+use rt::{ExceptionFrame, entry, exception};
 
 #[entry]
 fn main() -> ! {

cortex-m-rt/examples/override-exception.rs

@@ -5,7 +5,7 @@
 extern crate cortex_m_rt;
 extern crate panic_halt;
 
-use cortex_m_rt::{entry, exception, ExceptionFrame};
+use cortex_m_rt::{ExceptionFrame, entry, exception};
 
 #[entry]
 fn foo() -> ! {

cortex-m-rt/examples/unsafe-hard-fault.rs

@@ -7,7 +7,7 @@
 extern crate cortex_m_rt;
 extern crate panic_halt;
 
-use cortex_m_rt::{entry, exception, ExceptionFrame};
+use cortex_m_rt::{ExceptionFrame, entry, exception};
 
 #[entry]
 unsafe fn main() -> ! {

cortex-m-rt/examples/unsafety.rs

@@ -11,7 +11,7 @@
 extern crate cortex_m_rt;
 extern crate panic_halt;
 
-use cortex_m_rt::{entry, exception, interrupt, pre_init, ExceptionFrame};
+use cortex_m_rt::{ExceptionFrame, entry, exception, interrupt, pre_init};
 
 #[allow(non_camel_case_types)]
 enum interrupt {

cortex-m-rt/examples/warnings.rs

@@ -7,7 +7,7 @@
 //! applicable.
 
 use core::arch::asm;
-use core::sync::atomic::{compiler_fence, Ordering};
+use core::sync::atomic::{Ordering, compiler_fence};
 
 #[inline(always)]
 pub unsafe fn __bkpt() {
@@ -228,7 +228,7 @@ pub use self::v7m::*;
 #[cfg(any(armv7m, armv8m_main))]
 mod v7m {
     use core::arch::asm;
-    use core::sync::atomic::{compiler_fence, Ordering};
+    use core::sync::atomic::{Ordering, compiler_fence};
 
     #[inline(always)]
     pub unsafe fn __basepri_max(val: u8) {