Update copyright year of changed file

See gh-26417

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-jta-atomikos/src/main/java/smoketest/atomikos/SampleAtomikosApplication.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 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.