Increase PHPStan level

@amanmansuri72 this issue is for phpstan, not phpcs. That effort belongs on 🐛 Drupal Coding Standards Issues | phpcs Needs work .

Hello,
I fixed some errors shown at level 2 to level 6 can u check that ?

For the error below, I have checked the interface containing the signature of the function "get" we have only one param "CountryCode", I think we should remove the second param in the class

------ ------------------------------------------------------------------------------- 
  Line   src/Plugin/GraphQL/DataProducer/AddressFormatRepository.php                    
 ------ ------------------------------------------------------------------------------- 
  98     Method                                                                         
         CommerceGuys\Addressing\AddressFormat\AddressFormatRepositoryInterface::get()  
         invoked with 2 parameters, 1 required.                                         
 ------ ------------------------------------------------------------------------------- 

What do you think ?

Hi h_kac, if you would like work to be reviewed, please open a MR and set the issue to 'Needs Review' :)

Changes in the MR aren't seems to be phpstan related.

cc: @darvanen

Yeah that would be from #2, feel free to revert that commit, it belongs in another issue per #3.

It looks like the MR doesn't contain any change to set the PHPStan level higher for the test runner too.