Upgrade to Graphqlite 5

[devmaslov]

I'm onto updating the Symfony bundle and this lib has gotten in the way. So it should be updated first.

@moufmouf I don't have rights to merge this PR and tag the version. Could you do that? Or grant the permissions to me?
BTW, I'm curious why this logic was separated from the main bundle?

[moufmouf]

Hey @devmaslov ,

Sorry about that, you should have received an invite right now to be maintainer of this package too.

This package is separated from the Symfony bridge because some projects are using this package without Symfony.

For instance, if you have a project based on a PSR-15 middleware like Laminas, it is absolutely possible to use the Symfony validator without Symfony. Hence the need to make it separate from the Symfony bundle.
And I did not put it into GraphQLite itself because I wanted to avoid the dependency of GraphQLite on a given version of the Symfony validator package.

[devmaslov]

@moufmouf got it, thanks!

[devmaslov]

Closing as a duplicate of #60