Reach PHPStan level 5

[k00ni]

With PHPStan level 5 we got the following:

   0. basic checks, unknown classes, unknown functions, unknown methods 
      called on $this, wrong number of arguments passed to those methods and functions, 
      always undefined variables
   1. possibly undefined variables, unknown magic methods and properties on classes with __call and __get
   2. unknown methods checked on all expressions (not just $this), validating PHPDocs
   3. return types, types assigned to properties
   4. basic dead code checking - always false instanceof and other type checks, 
      dead else branches, unreachable code after return; etc.
X  5. checking types of arguments passed to methods and functions

For more information: https://phpstan.org/user-guide/rule-levels