fix lint directive for NSRT

Author: schlndh

tests/PHPStan/Analyser/nsrt/bcmath-number.php

@@ -1,4 +1,6 @@
-<?php declare(strict_types = 1); // lint >= 8.4
+<?php // lint >= 8.4
+
+declare(strict_types = 1);
 
 namespace BcMathNumber;