The "Symfony\Component\Config\Definition\Builder\TreeBuilder::root()" method called for the "fos_message" configuration is deprecated since Symfony 4.3, pass the root name to the constructor instead.

Deprecated call for Symfony 4.3 see:
```
The "Symfony\Component\Config\Definition\Builder\TreeBuilder::root()" method called for the "fos_message" configuration is deprecated since Symfony 4.3, pass the root name to the constructor instead.
```