Merge branch '5.0'

* 5.0: (27 commits)
  Fix versions
  [Security/Http] Allow setting cookie security settings for delete_cookies
  [DI] fix generating TypedReference from PriorityTaggedServiceTrait
  [FrameworkBundle] revert to legacy wiring of the session when circular refs are detected
  bumped Symfony version to 3.4.40
  updated VERSION for 3.4.39
  update CONTRIBUTORS for 3.4.39
  updated CHANGELOG for 3.4.39
  [DomCrawler] Fix BC break in assertions breaking Panther
  [BrowserKit] fixed missing post request parameters in file uploads
  update Italian translation
  [Validator] Add missing Hungarian translations
  [Validator] Add the missing translations for the Arabic (ar) locale
  [Validator] Add missing vietnamese translations
  [Console] Fix OutputStream for PHP 7.4
  add missing gitattributes for phpunit-bridge
  add German translations
  Bump Symfony version to 5.0.7
  Update VERSION for 5.0.6
  Update CHANGELOG for 5.0.6
  ...

Author: nicolas-grekas

.gitattributes

@@ -1,3 +1,4 @@
 /Tests export-ignore
 /phpunit.xml.dist export-ignore
+/.gitattributes export-ignore
 /.gitignore export-ignore