Resolve #3339853 "Drupal 10 fixes"

Closes #3339853

src/Logger/Stdout.php

@@ -44,7 +44,7 @@ class Stdout implements LoggerInterface {
   /**
    * {@inheritdoc}
    */
-  public function log($level, $message, array $context = []) {
+  public function log($level, $message, array $context = []): void {
     global $base_url;
 
     if ($this->config->get('use_stderr') == '1' && $level <= RfcLogLevel::WARNING) {