Bump to PHPStan Latte level 6

[spaze]

Oh look this was easy 😅

Ref #141

[lulco]

Time for next level :D

In my case there are these checkpoints:
Level 2 - get it works
Level 5 - more errors
Level 6 - types everywhere
Level 8 - nullable
Level 9 - mixed (unreachable because of ActiveRow)

[spaze]

Already exploring level 7. Got some 50 errors, some seem duplicated but fixing those is slow because I have to check whether it's me, you, or Latte? If it's not me, is it a bug, or is it me but just holding it wrong?

In most cases I can find a workaround, but guess that doesn't help you much :-)

[lulco]

If you are not sure, create issue :) we can check it too in some spare time. Sometimes it is phpstan itself and you just have to write your code the way to satisfy it.

[spaze]

Cool, thanks. Let me know if you think I create one too many issues or they're 🐂💩 🤭