PHP 8.1 Compatibility

[sivaschenko]

Preventing the error appearing on PHP 8.1:

------------------------------------------------------------------------------------------------------------------------------------------------------
 1 | ERROR | An error occurred during processing; checking has been aborted. The error message was: trim(): Passing null to parameter #1 ($string) of
   |       | type string is deprecated in
   |       | /Users/sivashch/Projects/magento-coding-standard/vendor/phpcompatibility/php-compatibility/PHPCompatibility/Sniff.php on line 131
------------------------------------------------------------------------------------------------------------------------------------------------------

Test builds sensitivity improved in #367

Fixes https://jira.corp.magento.com/browse/AC-2349

[sivaschenko]

@magento import pr to magento-commerce/magento-coding-standard

[m2-github-services]

@sivaschenko the Pull Request is successfully imported.