Switch cocur/slugify to symfony/string

[eerison]

Switch cocur/slugify to symfony/string

in order to use more symfony packages and keep this repo using the same dependencies as admin bundle

I suggest we change slugify to symfony/string!

in case it makes sense, then I will try to do it :D

[VincentLanglet]

in case it makes sense, then I will try to do it :D

Sure it make sense ; but I dunno if we'll be able to drop the dependency in a BC way.

Pr is opened.

[eerison]

Yeah, we need to keep the dependency in 4.x and remove in 5.x only.

We need the both dependencies to keep BC compatibility

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