Merge branch '6.4' into 7.0

* 6.4:
  [Router] Discard in-memory cache of routes when writing the file-based cache
  [Security] Verify Hungarian translation
  force HTTP 1.1 for Mailgun API requests
  [String] Revert "Fixed u()->snake(), b()->snake() and s()->snake() methods"
  normalize underscores in snake()
  [Security][Validator] Added missing Portuguese(pt) translations
  Fixes #54550 some pt_BR translations
  Fix MockArraySessionStorage to generate more conform ids
  Bump Symfony version to 5.4.42
  Update VERSION for 5.4.41
  Update CONTRIBUTORS for 5.4.41
  Update CHANGELOG for 5.4.41

Author: derrabus

Router.php

@@ -225,6 +225,7 @@ function (ConfigCacheInterface $cache) {
                 }
 
                 $cache->write($dumper->dump(), $this->getRouteCollection()->getResources());
+                unset(self::$cache[$cache->getPath()]);
             }
         );
 
@@ -254,6 +255,7 @@ function (ConfigCacheInterface $cache) {
                     $dumper = $this->getGeneratorDumperInstance();
 
                     $cache->write($dumper->dump(), $this->getRouteCollection()->getResources());
+                    unset(self::$cache[$cache->getPath()]);
                 }
             );