build: bump msrv to 1.60.0

the log crates requires this after Debian 12/bookworm released

examples/example.rs

@@ -61,7 +61,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     terminal.show_cursor()?;
 
     if let Err(err) = res {
-        println!("{:?}", err);
+        println!("{err:?}");
     }
 
     Ok(())