Does not recognize method signature of Redis::scan

[paulbalandan]

Bug report

Code snippet that reproduces the problem

https://phpstan.org/r/0f03de05-011d-4e7f-b835-150f5b6f7043

Using PHPStan 0.12.85, it seems it does not recognize the method signature of Redis::scan($iterator, $patter, $count).
$iterator is passed by reference and initially set to null. During scan, this can become non-zero and returns to zero when
scanning is complete. Since $iterator is passed by reference, then its value could be changed to a non-zero int but phpstan
thinks it will always stay as null.

Expected output

No errors.

[ondrejmirtes]

Fixed: phpstan/phpstan-src@8fe9e60

[github-actions]

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