Update License file to add copyright owner

[bradmccoydev]

In the license file on line 189 the authors haven't been stated, this is a common thing that people miss when adding apache2 licenses.

I will create a PR to update it. This is also throughout the repos so we will need to update them also I can get some students to do it as a good first issue. I will do this one for an example

[bradmccoydev]

Copyright 2023 The cdevents Authors

[afrittoli]

Thanks @bradmccoydev