ci: don't install cargo-edit

examples/itm.rs

@@ -18,7 +18,7 @@
 #[macro_use]
 extern crate cortex_m;
 extern crate cortex_m_rt;
-extern crate panic_itm; // panicking behavior
+extern crate panic_abort; // panicking behavior
 
 use cortex_m::{asm, Peripherals};
 
@@ -27,9 +27,6 @@ fn main() {
     let mut itm = p.ITM;
 
     iprintln!(&mut itm.stim[0], "Hello, world!");
-
-    // Also prints the panic message to the ITM
-    panic!("Oops");
 }
 
 // As we are not using interrupts, we just register a dummy catch all handler