Cache for classes included by @mixin might not be flushed if file changed

[ComiR]

Bug report

I changed a method signature in a class only included by @mixin (at least as far as PHPStan can see). Before the change, I already ran PHPStan, so the cache was already created. After the change, PHPStan did obviously use the cache file also for the class/file included by @mixin, as it did not find the now wrong calls to the method.

Code snippet that reproduces the problem

Before: https://phpstan.org/r/bd3b6174-e5ca-4fe3-a89e-9f13f672e1d6
After: https://phpstan.org/r/9483ab8b-38f5-458c-bf03-2bd87793c341

Expected output

Actually the output of "After", not the cached one from "Before".

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[ondrejmirtes]

Test: phpstan/phpstan-src@2cccd61
Fix: phpstan/phpstan-src@7228d4d

[github-actions]

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