There's a merged pull request on the void-packages repository

python3-PyPDF2: rename to python3-pypdf, update to 3.4.1.
https://github.com/void-linux/void-packages/pull/42227

Description:
#### Testing the changes
- I tested the changes in this PR: **briefly**

#### Local build testing
- I built this PR locally for my native architecture: **x86_64**

I noticed the upstream rename while trying to update `diffoscope` a couple of days ago.