Merge branch '3.4'

* 3.4:
  Argon2i Password Encoder
  [DI] EnvVarProcessorInterface: fix missing use
  [FrameworkBundle] Use PhpExtractor from Translation
  [DowCrawler] Default to UTF-8 when possible

Author: nicolas-grekas

Resources/config/translation.xml

@@ -121,7 +121,7 @@
             <tag name="translation.dumper" alias="res" />
         </service>
 
-        <service id="translation.extractor.php" class="Symfony\Bundle\FrameworkBundle\Translation\PhpExtractor">
+        <service id="translation.extractor.php" class="Symfony\Component\Translation\Extractor\PhpExtractor">
             <tag name="translation.extractor" alias="php" />
         </service>