Apply consistent copyright headers in Kotlin source code

See gh-35070

spring-context/src/main/kotlin/org/springframework/ui/ModelExtensions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-present the original author or authors
+ * Copyright 2002-present 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/src/main/kotlin/org/springframework/ui/ModelMapExtensions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-present the original author or authors
+ * Copyright 2002-present 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/src/test/kotlin/org/springframework/ui/ModelExtensionsTests.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-present the original author or authors
+ * Copyright 2002-present 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/src/test/kotlin/org/springframework/ui/ModelMapExtensionsTests.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-present the original author or authors
+ * Copyright 2002-present 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-jdbc/src/main/kotlin/org/springframework/jdbc/core/namedparam/MapSqlParameterSourceExtensions.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-present the original author or authors
+ * Copyright 2002-present 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-jdbc/src/test/kotlin/org/springframework/jdbc/core/DataClassRowMapperKotlinTests.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-present the original author or authors
+ * Copyright 2002-present 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-jdbc/src/test/kotlin/org/springframework/jdbc/core/JdbcOperationsExtensionsTests.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-present the original author or authors
+ * Copyright 2002-present 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-jdbc/src/test/kotlin/org/springframework/jdbc/core/namedparam/MapSqlParameterSourceExtensionsTests.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-present the original author or authors
+ * Copyright 2002-present 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.