Update copyright date to 2024 so that travis-ci passes

[ni-jfitzger]

• [X] This contribution adheres to CONTRIBUTING.md.
• [ ] ~I've updated CHANGELOG.md if applicable.~
• [ ] ~I've added tests applicable for this pull request~

What does this Pull Request accomplish?

The time between when the last PR was posted and when it was merged was so long that the year changed, leading the merged code to not mach tox -e codegen and causing the travis-ci build of the commit to fail.

List issues fixed by this Pull Request below, if any.

None

What testing has been done?

PR Checks