`npm run lint:php` command doesn't work on PHP 8.x

[gigitux]

Describe the bug

Currently, the current version of woocommerce-sniffs isn't compatible with the PHP 8.x version. If you run the command npm run lint:php with PHP 8.x, you have this error for each .PHP file:

FOUND 1 ERROR AFFECTING 1 LINE
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 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/gigitux/work/woocommerce-blocks/vendor/wp-coding-standards/wpcs/WordPress/Sniffs/NamingConventions/PrefixAllGlobalsSniff.php on line 280 (Internal.Exception)
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We are already working on upgrading woocommerce-sniffs with #11724.

To reproduce

Steps to reproduce the behavior:

1. Ensure that you are using PHP 8.x.
2. Run npm run lint:php.
3. See the errors.

[github-actions]

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