[FrameworkBundle] don't use abstract methods in MicroKernelTrait, their semantics changed in PHP 8 #36936
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In PHP 8, abstract methods on traits are now enforcing that their using classes match the signature.
But this is not the semantics we need in this trait: we want to allow ppl to use a different type of configurators, to provide extensibility of the DSL each provide.
This makes nightly job fail with fatal error currently.
There is no other options here.
/cc @nikic FYI