Remove unused import.

Author: Maria Paszkiewicz SCC

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

@@ -4,7 +4,6 @@
 
 import java.util.function.IntFunction;
 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;