[CI] Use vendor/bin directory

Author: hlecorche

.github/workflows/tests.yml

@@ -82,11 +82,11 @@ jobs:
 
             -   name: Run PHPUnit
                 if: matrix.coding-standards != true && matrix.analyze-dependencies != true && matrix.static-analysis != true
-                run: php vendor/phpunit/phpunit/phpunit
+                run: php vendor/bin/phpunit
 
             -   name: Run PHP CS Fixer
                 if: matrix.coding-standards
-                run: php vendor/friendsofphp/php-cs-fixer/php-cs-fixer fix --diff --dry-run -v
+                run: php vendor/bin/php-cs-fixer fix --diff --dry-run -v
 
             -   name: Analyze composer dependencies
                 if: matrix.analyze-dependencies