URL Cleanup - license headers - target subpackages

This commit updates license headers for source files residing in
subpackages named `target`.

Closes gh-22634

spring-context/src/test/java/org/springframework/aop/target/CommonsPool2TargetSourceTests.java

@@ -5,7 +5,7 @@
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- *      http://www.apache.org/licenses/LICENSE-2.0
+ *      https://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,