Merge branch '4.3' into 4.4

* 4.3:
  [DotEnv] Remove `usePutEnv` property default value
  Set up typo fix
  [Validator] Allow underscore character "_" in URL username and password
  [SecurityBundle] Passwords are not encoded when algorithm set to \"true\"
  do not validate passwords when the hash is null
  [DI] fix resolving bindings for named TypedReference
  [DI] Fix making the container path-independent when the app is in /app
  Allow copy instead of symlink for ./link script
  [FrameworkBundle] resolve service locators in `debug:*` commands
  bumped Symfony version to 4.3.10
  updated VERSION for 4.3.9
  updated CHANGELOG for 4.3.9
  bumped Symfony version to 3.4.37
  updated VERSION for 3.4.36
  update CONTRIBUTORS for 3.4.36
  updated CHANGELOG for 3.4.36
  Add test on ServerLogHandler

Author: xabbuh

Dotenv.php

@@ -35,7 +35,7 @@ final class Dotenv
     private $data;
     private $end;
     private $values;
-    private $usePutenv = true;
+    private $usePutenv;
 
     /**
      * @var bool If `putenv()` should be used to define environment variables or not.