style: remove unused imports from PerfectSquareTest

Author: vil02

src/test/java/com/thealgorithms/maths/PerfectSquareTest.java

@@ -1,8 +1,6 @@
 package com.thealgorithms.maths;
 
-import java.util.stream.Stream;
 import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;