fix warnings

Author: rkrishn7

src/auth.rs

@@ -39,7 +39,7 @@ pub fn rand_alphanumeric(len: usize) -> String {
     let chars: String = std::iter::repeat(())
         .map(|()| rng.sample(rand::distributions::Alphanumeric))
         .map(char::from)
-        .take(7)
+        .take(len)
         .collect();
 
     chars

src/pool.rs

@@ -508,7 +508,7 @@ impl ConnectionPool {
                 // before setting it globally.
                 // Do this async and somewhere else, we don't have to wait here.
                 if config.general.validate_config {
-                    let mut validate_pool = pool.clone();
+                    let validate_pool = pool.clone();
                     tokio::task::spawn(async move {
                         let _ = validate_pool.validate().await;
                     });