Polish contribution

See gh-23651

spring-context-support/src/main/java/org/springframework/mail/MailSender.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-context-support/src/main/java/org/springframework/mail/javamail/JavaMailSender.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,7 +20,7 @@ import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;
 
-import javax.mail.MessagingException;
+import jakarta.mail.MessagingException;
 import jakarta.mail.internet.MimeMessage;
 
 import org.springframework.mail.MailException;