[Backport 3.x] Removed skipping of CountOnNull rector rule. (#191)

Co-authored-by: Mark Dorison <[email protected]>
Fixed upstream: rectorphp/rector-src#4556

.github/workflows/ci.yml

@@ -4,7 +4,7 @@ on:  # yamllint disable-line rule:truthy
   # Trigger the workflow on pushes to the main branch and all pull requests.
   push:
     branches:
-      - "**.x"
+      - "[0-9].x"
   pull_request:
 
 jobs:

rector.php

@@ -3,7 +3,6 @@
 declare(strict_types=1);
 
 use Rector\Config\RectorConfig;
-use Rector\Php71\Rector\FuncCall\CountOnNullRector;
 use Rector\Php80\Rector\FunctionLike\MixedTypeRector;
 use Rector\Set\ValueObject\LevelSetList;
 use Rector\Set\ValueObject\SetList;
@@ -20,10 +19,6 @@
     ]);
 
     $rectorConfig->skip([
-        MixedTypeRector::class,
-        CountOnNullRector::class => [
-            // @see https://github.com/rectorphp/rector/issues/8016
-            __DIR__ . '/src/Robo/Plugin/Traits/SitesConfigTrait.php',
-        ],
+        MixedTypeRector::class
     ]);
 };