fix: enforce lowercase email addresses

src/BusProNet/UserDataHandler.php

@@ -142,7 +142,7 @@ class UserDataHandler
         }
 
         $users = $repository->findBy([
-            'email' => $email,
+            'email' => mb_strtolower(trim($email)),
         ]);
 
         if (1 !== count($users)) {