Add import statement for JUnit test class

Author: ruturajjadhav07

src/test/java/com/thealgorithms/prefixsum/RangeSumQueryTest.java

@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+
 import org.junit.jupiter.api.Test;
 
 /**