fix(deps): pin dependencies

This MR contains the following updates:

Package	Type	Update	Change
symfony/console (source)	require	pin	* -> 4.3.4
symfony/dotenv (source)	require	pin	* -> 4.3.4
symfony/flex	require	pin	^1.3.1 -> 1.4.6
symfony/framework-bundle (source)	require	pin	* -> 4.3.4
symfony/orm-pack	require	pin	^1.0 -> 1.0.6
symfony/profiler-pack	require-dev	pin	^1.0 -> 1.0.4
symfony/twig-bundle (source)	require	pin	4.3.* -> 4.3.4
symfony/yaml (source)	require	pin	* -> 4.3.4

Add the preset :preserveSemverRanges to your config if you don't want to pin your dependencies.

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