Merge pull request #33923 from nextcloud/backport/33813/stable22

[stable22] Compare lowercase email when updating from ldap

lib/private/User/User.php

@@ -193,7 +193,7 @@ class User implements IUser {
 			$this->setPrimaryEMailAddress('');
 		}
 
-		if ($oldMailAddress !== $mailAddress) {
+		if ($oldMailAddress !== strtolower($mailAddress)) {
 			$this->triggerChange('eMailAddress', $mailAddress, $oldMailAddress);
 		}
 	}