fix: enforce lowercase email addresses

src/Security/MyEpAuthenticator.php

@@ -255,6 +255,7 @@ class MyEpAuthenticator extends AbstractAuthenticator
 
         $addressId = $userinfo['address_id'] ?? null;
         $personId = $userinfo['person_id'] ?? null;
+        $email = mb_strtolower(trim($userinfo['email']));
 
         if (null !== $addressId && null !== $personId) {
             $user = $repository->findOneBy([
@@ -267,12 +268,12 @@ class MyEpAuthenticator extends AbstractAuthenticator
             }
         }
 
-        $users = $repository->findBy(['email' => $userinfo['email']]);
+        $users = $repository->findBy(['email' => $email]);
 
         if (1 !== count($users)) {
             if (1 < count($users)) {
                 $this->logger->warning('Unable to match local user by email: multiple users found', [
-                    'email' => $userinfo['email'],
+                    'email' => $email,
                     'count' => count($users),
                 ]);
             }