clippy: fix io_other_error lint

https://rust-lang.github.io/rust-clippy/rust-1.94.0/index.html#io_other_error

src/uu/tar/tests/test_errors.rs

@@ -44,10 +44,7 @@ fn test_tar_error_code() {
         .code(),
         2
     );
-    assert_eq!(
-        TarError::Io(io::Error::new(io::ErrorKind::Other, "test")).code(),
-        2
-    );
+    assert_eq!(TarError::Io(io::Error::other("test")).code(), 2);
 }
 
 #[test]