Remove unused import in JodaTimeScannerTest

Author: timtebeek

src/test/java/org/openrewrite/java/migrate/joda/JodaTimeScannerTest.java

@@ -21,8 +21,6 @@
 import org.openrewrite.test.RecipeSpec;
 import org.openrewrite.test.RewriteTest;
 
-import java.util.HashSet;
-
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.openrewrite.java.Assertions.java;