Require constructor property promotion

[spaze]

PHP 8.0+ feature so code targeting older PHPs would need to exclude it, just like trailing commas in calls for example.

This is how you'd exclude it, dear future me:

<rule ref="vendor/spaze/coding-standard/src/ruleset.xml">
	<exclude name="SlevomatCodingStandard.Classes.RequireConstructorPropertyPromotion"/>  <!-- 👈 this line -->
</rule>