Merge branch '5.4' into 6.0

* 5.4:
  [HttpClient] fix RetryableHttpClient when a response is canceled
  Deprecate passing null as $requestIp to IpUtils::checkIp(), checkIp4() and checkIp6()
  [Uid] fix 4 missing bits of entropy in UUIDv4
  Add a warning in WDT if using symfony/symfony
  [Notifier][Twilio] Ensure from/sender is valid via regex
  Lower log level in case of retry
  GuardEvent::getTransition() cannot return null
  [String] Add `trimSuffix()` and `trimPrefix()` methods
  [DependencyInjection] autowire union and intersection types
  [Runtime] Drop class validation of composer "extra.runtime.class"

Author: nicolas-grekas

HttpCache/SubRequestHandler.php

@@ -31,7 +31,7 @@ public static function handle(HttpKernelInterface $kernel, Request $request, int
 
         // remove untrusted values
         $remoteAddr = $request->server->get('REMOTE_ADDR');
-        if (!IpUtils::checkIp($remoteAddr, $trustedProxies)) {
+        if (!$remoteAddr || !IpUtils::checkIp($remoteAddr, $trustedProxies)) {
             $trustedHeaders = [
                 'FORWARDED' => $trustedHeaderSet & Request::HEADER_FORWARDED,
                 'X_FORWARDED_FOR' => $trustedHeaderSet & Request::HEADER_X_FORWARDED_FOR,