Last update broke symfony <6.1 support

[achterin]

Since this bundle is now extenting AbstractBundle support for symfony versions prior 6.1 is broken. The symfony documentation states:

If your bundle must be compatible with previous Symfony versions you have to extend from the Bundle instead.

As AbstractBundle was introduced in v6.1 you'll get the following error trying to install the latest version on older symfony versions:

[critical] Uncaught Error: Class "Symfony\Component\HttpKernel\Bundle\AbstractBundle" not found

[unbreak]

@achterin i've changed in composer.json to:

"specshaper/encrypt-bundle": "3.0.2"`

and it worked