PHP 8.3 | ReportWidthTest: fix deprecation notices for ReflectionProperty::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 the `Core/Config/ReportWidthTest` to pass `null` as the "object" for setting the value of a static property to make the method call cross-version compatible.

Ref: https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures#reflectionpropertysetvalue

Author: jrfnl

tests/Core/Config/ReportWidthTest.php

@@ -285,7 +285,7 @@ public static function setStaticProperty($name, $value)
     {
         $property = new ReflectionProperty('PHP_CodeSniffer\Config', $name);
         $property->setAccessible(true);
-        $property->setValue($value);
+        $property->setValue(null, $value);
         $property->setAccessible(false);
 
     }//end setStaticProperty()