Merge branch '4.4' into 5.4

* 4.4:
  add alternative method to force version with symfony/flex

Author: javiereguiluz

bundles/best_practices.rst

@@ -233,6 +233,8 @@ with Symfony Flex to install a specific Symfony version:
 
     # this requires Symfony 5.x for all Symfony packages
     export SYMFONY_REQUIRE=5.*
+    # alternatively you can run this command to update composer.json config
+    # composer config extra.symfony.require "5.*"
 
     # install Symfony Flex in the CI environment
     composer global config --no-plugins allow-plugins.symfony/flex true