chore: update license year and add author tags

Updated license headers to reflect year 2025 in all modified Java files.
Also added @author Javadoc tags with full name to classes modified in the previous commit as requested in PR review.

Signed-off-by: HyeongDo-Myeong <[email protected]>

Author: HyeongDo-Myeong

spring-cloud-openfeign-core/src/main/java/org/springframework/cloud/openfeign/FeignClientsRegistrar.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2024 the original author or authors.
+ * Copyright 2013-2025 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.
@@ -66,6 +66,7 @@
  * @author Olga Maciaszek-Sharma
  * @author Jasbir Singh
  * @author Jinho Lee
+ * @author HyeongDo Myeong
  */
 class FeignClientsRegistrar implements ImportBeanDefinitionRegistrar, ResourceLoaderAware, EnvironmentAware {
 

spring-cloud-openfeign-core/src/test/java/org/springframework/cloud/openfeign/FeignClientsRegistrarTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2024 the original author or authors.
+ * Copyright 2013-2025 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.
@@ -42,6 +42,7 @@
  * @author Michal Domagala
  * @author Szymon Linowski
  * @author Olga Maciaszek-Sharma
+ * @author HyeongDo Myeong
  */
 class FeignClientsRegistrarTests {