Merge branch '4.4' into 5.0

* 4.4:
  add missing gitattributes for phpunit-bridge
  Bump Symfony version to 4.4.7
  Update VERSION for 4.4.6
  Update CHANGELOG for 4.4.6

Author: fabpot

.gitattributes

@@ -0,0 +1,4 @@
+/Tests export-ignore
+/phpunit.xml.dist export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore