Update Rust to edition 2024

geneit_backend/src/utils/string_utils.rs

@@ -3,4 +3,4 @@ use rand::distr::{Alphanumeric, SampleString};
 /// Generate a random string of a given length
 pub fn rand_str(len: usize) -> String {
     Alphanumeric.sample_string(&mut rand::rng(), len)
-}
+}