Remove unused import

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Author: timtebeek

src/main/java/org/openrewrite/java/migrate/guava/NoGuavaIterablesTransform.java

@@ -21,7 +21,6 @@
 import org.openrewrite.TreeVisitor;
 import org.openrewrite.java.JavaIsoVisitor;
 import org.openrewrite.java.JavaTemplate;
-import org.openrewrite.java.JavaVisitor;
 import org.openrewrite.java.MethodMatcher;
 import org.openrewrite.java.search.UsesMethod;
 import org.openrewrite.java.tree.J;