Resolve PHPStan issue with deprecated parameter order in PHP 8.1

[sayuprc]

Since PHP 8.1, a nullable, optional parameter with a default value of null followed by a required parameter will generate a warning.
The current PHPStan did not recognize such code as deprecated.
This PR updates PHPStan to properly handle such cases.
Please review.
Thank you.

resolve phpstan/phpstan#6668

[phpstan-bot]

You've opened the pull request against the latest branch 1.11.x. If your code is relevant on 1.10.x and you want it to be released sooner, please rebase your pull request and change its target to 1.10.x.

[ondrejmirtes]

I'm worried this is a lot more complex topic. For example: Why is this reported only on PHP 8.3+? https://3v4l.org/e6n6Q

Also - your message says "Deprecated in 8.0" but in code your condition says >= 80100.

[sayuprc]

Thank you for the review.

I was aware that this code was generating deprecated warnings from PHP 8.1. https://3v4l.org/0VAUk
It seems that there are differences in behavior with patterns like int|null, so I will investigate it again.

[sayuprc]

@ondrejmirtes
Since PHP 8.3, the deprecated conditions have changed, and warnings for union types and mixed types are also issued.

For this update, I am considering issuing warnings for nullable types deprecated since PHP 8.1 and for union types and mixed types deprecated since PHP 8.3.

I would like the message format to only replace the version number.
For example, in the case of mixed $a = null, it would display "Deprecated in PHP 8.3".

[ondrejmirtes]

@sayuprc Yes, that would be okay 👍

[ondrejmirtes]

Awesome, thank you!

[ondrejmirtes]

I just noticed this doesn't make any tests fail - is that right? 6512a84

[sayuprc]

@ondrejmirtes
If you remove $targetPhpVersion = null;, you won't be able to display the correct PHP version in the warning message for code like fn (int|null $a = null, int $b, int $c = 0, $d): int => 1;.

[ondrejmirtes]

@sayuprc Please send a fix with a test as a new PR. Thank you.

[sayuprc]

@ondrejmirtes
I have created a new pull request. #2971