Bug report

It appears that there's a mismatch in the parameter types for \SessionUpdateTimestampHandlerInterface. I checked the phpstorm-stubs, and the type declared there is string (https://github.com/JetBrains/phpstorm-stubs/blob/05d145c0bbafcf9a551fdd8824adb2a7e259fdaf/session/SessionHandler.php#L132). But PHPStan seems to believe it is
mixed (on PHP versions lower that 8.0)

Code snippet that reproduces the problem

https://phpstan.org/r/f988cac3-c01b-4845-978d-17071e28a616

Expected output

No errors