Array shape is lost on array_push with ...splat

[leongersen]

Bug report

I've reported the very similar #5783 before, which was fixed (thanks!).

In 1.6.0, using array_push with the splat operator loses the array shape for the array. "regular" uses of array_push or $a[] = do not have this issue.

Code snippet that reproduces the problem

https://phpstan.org/r/35e49621-9df6-4eed-960e-e030acc9728e

Expected output

$a, $b and $c all report array<int, array{a: int, b: string}>;

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[ondrejmirtes]

/cc @herndlm who did phpstan/phpstan-src#1232 :)

[github-actions]

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