Dependency of `laminas/laminas-servicemanager` can be removed

Feature Request

Q	A
BC Break	no

Summary

Hey there, I realized that this component still depends on servicemanager while it provides its own ContainerInterface implementation.

This package is considered feature-complete, and is now in security-only maintenance mode, following a decision by the Technical Steering Committee. If you have a security issue, please follow our security reporting guidelines. If you wish to take on the role of maintainer, please nominate yourself

This one?

https://github.com/laminas/laminas-crypt/blob/56ab1b195dad5456753601ff2e8e3d3fd9392d1a/src/Symmetric/PaddingPluginManager.php#L17

Yep, we can drop the dependency :+1:

Note that upgrading to psr/container:^2 is trickier, because the implementations are not final

Closed via #33