ENGCOM-7906: ScopeConfigInterface can be more than a string #29305

 - Merge Pull Request #29305 from fooman/magento2:patch-4
 - Merged commits:
   1. 8bb3b5e
   2. 4cc85f3

Author: magento-engcom-team

dev/tests/integration/framework/Magento/TestFramework/Annotation/ConfigFixture.php

@@ -69,9 +69,9 @@ protected function _getConfigValue($configPath, $scopeCode = null)
      * @param string $configPath
      * @param string $scopeType
      * @param string|null $scopeCode
-     * @return string|null
+     * @return mixed|null
      */
-    protected function getScopeConfigValue(string $configPath, string $scopeType, string $scopeCode = null): ?string
+    protected function getScopeConfigValue(string $configPath, string $scopeType, string $scopeCode = null)
     {
         $result = null;
         if ($scopeCode !== false) {