…erty::setValue()
The `ReflectionProperty::setValue()` method supports three method signatures, two of which are deprecated as of PHP 8.3.
This adjusts the call to `ReflectionProperty::setValue()` in various methods in the `UtilsTest` class to pass `null` as the "object" for setting the value of a static property to make the method calls cross-version compatible.
Note: these deprecations were visible in the test summary, but the tests - as they currently are - are not set up correctly to fail builds on deprecation notices, which is probably why this went unnoticed.
Ref: https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures#reflectionpropertysetvalue