Upgrade to Sylius 1.11

[lruozzi9]

Fixes #119

Changes proposed in this pull request:

• Drop support for Sylius 1.9 and 1.10
• Drop support for Symfony 4.4

@webgriffe/wg-devs what do you think about this PR ?

[LucaGallinari]

It would be useful to have the source URLs of the changes (if taken from somewhere) or a few words about it in the description of the PR (if custom), about the changes that have been made, otherwise it's hard to discern their correctness, or it's a double effort to find PRs etc in the web.
I found these:

• Sylius skeleton plugin 1.11 bump
• Fixes to security.yaml
  but something is missing

[LucaGallinari]

Oh, ok. Found this: https://github.com/Sylius/PluginSkeleton/pull/321/files
Didn't see it as it has not been released yet, so the compare didn't find it.

[lruozzi9]

Oh, ok. Found this: https://github.com/Sylius/PluginSkeleton/pull/321/files Didn't see it as it has not been released yet, so the compare didn't find it.

Yes, that PR has not been already tagged but is needed to make tests green and also to align the test/application with the Sylius 1.11 configurations.

[lruozzi9]

It still fails on JS behat, I think that is due again to the admin icon image 🤬

[lruozzi9]

I think this Sylius/Sylius#13753 could resolve the problem definitively, but until is not released I don't know how to fix the build 🤷‍♂️

[lruozzi9]

Another problem is that composer does not install Sylius 1.11.2 (Sylius/PluginSkeleton#323). The problem is still present in local also with that version.