Scaladoc tests need to be updated to `Copyright (c) 2002-2024`

[nicolasstucki]

We have the following failure on master with scaladoc tests

• https://github.com/lampepfl/dotty/actions/runs/7395118069/job/20117666671

Based on the timeline, this issue started in #18967. But when reverting this PR (#19358) we still get the same issue.

[nicolasstucki]

Note that this is the first merge after new year. Maybe it is an issue with a date. I see Copyright (c) 2002-2023 in the files that fail to check.

[nicolasstucki]

Yes, we need to update Copyright (c) 2002-2023 to Copyright (c) 2002-2024

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