fix clippy failure

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

Author: shtripat

crates/catalog/rest/src/auth/oauth2.rs

@@ -301,7 +301,7 @@ mod tests {
             "super-secret",
             "https://auth.example.com/token",
         );
-        let debug_str = format!("{:?}", auth);
+        let debug_str = format!("{auth:?}");
         assert!(!debug_str.contains("super-secret"));
     }
 

crates/catalog/rest/src/client.rs

@@ -15,6 +15,7 @@
 // specific language governing permissions and limitations
 // under the License.
 
+use std::collections::HashMap;
 use std::fmt::{Debug, Formatter};
 use std::sync::Arc;