allow public access to the NoRequestMappingAnnotation visitor.

Author: pway99

src/main/java/org/openrewrite/java/spring/NoRequestMappingAnnotation.java

@@ -69,7 +69,7 @@ protected TreeVisitor<?, ExecutionContext> getSingleSourceApplicableTest() {
     }
 
     @Override
-    protected TreeVisitor<?, ExecutionContext> getVisitor() {
+    public TreeVisitor<?, ExecutionContext> getVisitor() {
         return new NoRequestMappingAnnotationVisitor();
     }