Adapt PrivateConstantToSelfRector to work on non-final classes, too

[alfredbez]

Follow-up for #3178

Not sure about the change in the markdown files, part of it looks not unrelated to my change, probably someone forgot to generate that on main.

I'm not sure what to do for code like this:

<?php
class ParentClass {
	private const FOO = 'from parent';
	
	public function foo() {
		echo static::FOO;
	}
}

class ChildClass1 extends ParentClass {
	private const FOO = 'from child1';
}

I might add a check that changes static to self if all child-classes declare it as a private constant.

[samsonasik]

The docs is generated weekly so you don't have too :)

rector-src/.github/workflows/weekly_pull_requests.yaml

Line 23 in c21cafa

run: "composer docs"

[samsonasik]

since it configurable, it looks good 👍

[TomasVotruba]

Thank you 🥳