Merge branch '5.3' into 5.4

* 5.3:
  [DependencyInjection] only allow `ReflectionNamedType` for `ServiceSubscriberTrait`
  Fix CS
  [Intl] Update the ICU data to 70.1
  Default access_decision_manager.strategy option with merge.

Signed-off-by: Alexander M. Turek <me@derrabus.de>

Input/ArgvInput.php

@@ -141,7 +141,7 @@ private function parseLongOption(string $token)
         $name = substr($token, 2);
 
         if (false !== $pos = strpos($name, '=')) {
-            if (0 === \strlen($value = substr($name, $pos + 1))) {
+            if ('' === $value = substr($name, $pos + 1)) {
                 array_unshift($this->parsed, $value);
             }
             $this->addLongOption(substr($name, 0, $pos), $value);