Merge branch '4.4'

* 4.4:
  [DI] fix detecting singly implemented interfaces
  [FrameworkBundle] Disallow WebProfilerBundle < 4.4.
  [Form] Allow symfony/service-contracts v2.
  bumped Symfony version to 4.4.0
  updated VERSION for 4.4.0-BETA2
  updated CHANGELOG for 4.4.0-BETA2

Author: nicolas-grekas

composer.json

@@ -84,6 +84,7 @@
         "symfony/twig-bridge": "<4.4",
         "symfony/twig-bundle": "<4.4",
         "symfony/validator": "<4.4",
+        "symfony/web-profiler-bundle": "<4.4",
         "symfony/workflow": "<4.4"
     },
     "suggest": {