Spring Update copyright headers in spring-test

I changed the copyright date, I hope it will help you with the spring framework!

Comment From: pivotal-cla

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Comment From: pivotal-cla

@Yaklede Thank you for signing the Contributor License Agreement!

Comment From: sbrannen

Hi @Yaklede,

Congratulations on submitting your first PR for the Spring Framework! 👍

Please note that we typically don't accept PRs that update copyright headers for code changed several years ago, especially when the code is only in the "test" source tree.

However, since this is your first PR, I've gone ahead and merged this into main.

Thanks

Comment From: Yaklede

Hello @sbrannen , I'm so glad I was able to contribute to the spring! Thank you!