Remove string type declaration of parameter
#1639
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Fixes #1635 because: * Covariance allows a child's method to return a more specific type than the return type of its parent's method. * Contravariance allows a parameter type to be less specific in a child method, than that of its parent.
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Fixes #1635
because:
No test here, as I don't know how (and don't want) to mock parent class, but the proper test would be to test Infection with different supported Symfony versions, which is still not done