Ignore case for organization; example.org should match EXAMPLE.ORG

Author: tvdijen

src/Auth/Source/LdapMulti.php

@@ -23,6 +23,7 @@
 
 use function array_change_key_case;
 use function array_key_exists;
+use function strtolower;
 use function var_export;
 
 class LdapMulti extends UserPassOrgBase
@@ -126,6 +127,7 @@ protected function loginSasl(
         string $organization,
         array $sasl_args = [],
     ): array {
+        $organization = strtolower($organization);
         if ($this->includeOrgInUsername) {
             $username = $username . '@' . $organization;
         }