fix: remove unused JUnit @test import (Checkstyle violation)

Author: Shubh2-0

src/test/java/com/thealgorithms/strings/AlternativeStringArrangeTest.java

@@ -4,7 +4,6 @@
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import java.util.stream.Stream;
-import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;