[SimpleLawsTest] match new[] with delete[] instead of free

gcc 11.1 on my arch system complains that the calls to free
does not match the allocator function new[].

tests/SimpleLawsTest.cpp

@@ -99,8 +99,8 @@ static void alphaFun() {
 	}
 	cps.wait();
 
-	free(fiberData);
-	free(affinities);
+	delete[] fiberData;
+	delete[] affinities;
 
 	std::cerr << "Result: " << finalResult << std::endl;