Update phpstan.neon

Author: staabm

phpstan.neon

@@ -11,7 +11,6 @@ parameters:
         - '#Instanceof between .* and .* will always evaluate to true.#'
         - '#Strict comparison using !== between .*non-empty-string.* and .* will always evaluate to true.#'
         - '#Strict comparison using !== between .*non-falsy-string.* and .* will always evaluate to true.#'
-        - '#Call to function is_array\(\) with array will always evaluate to true.#'
 
     excludePaths:
         - src/Framework/MockObject/Runtime/Api # exclude partial traits, which are only used in runtime generated code