feat: upgrade keboola/coding-standard from v15 to v16

Author: zajca

composer.json

@@ -21,7 +21,7 @@
         "keboola/retry": "^0.5.0"
     },
     "require-dev": {
-        "keboola/coding-standard": "^15",
+        "keboola/coding-standard": "^16",
         "php-parallel-lint/php-parallel-lint": "^1.3",
         "phpstan/phpstan": "^2",
         "phpstan/phpstan-phpunit": "^2",