Apply suggestions from code review

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: timtebeek

src/test/java/org/openrewrite/java/migrate/jakarta/JavaxMailToJakartaMailTest.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2025 the original author or authors.
+ * <p>
+ * Licensed under the Moderne Source Available License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * https://docs.moderne.io/licensing/moderne-source-available-license
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.openrewrite.java.migrate.jakarta;
 
 import org.junit.jupiter.api.Test;
@@ -8,7 +23,7 @@
 import static org.openrewrite.java.Assertions.*;
 import static org.openrewrite.maven.Assertions.pomXml;
 
-public class JavaxMailToJakartaMailTest implements RewriteTest {
+class JavaxMailToJakartaMailTest implements RewriteTest {
     @Override
     public void defaults(RecipeSpec spec) {
         spec.parser(JavaParser.fromJavaVersion()