Fix Rust lints

Author: Jakub Konka

rust/server_utils/src/jwt/config.rs

@@ -54,10 +54,10 @@ impl Config {
 
 #[cfg(test)]
 mod test {
-    use super::*;
-
     use serde_json::json;
 
+    use super::*;
+
     #[test]
     fn validates_presence() {
         let expected = JwtClaim {