Update project dependencies and improve type hints here and there. After some investigations it turned out that Sort.Popular exhibits the same behavior as Sort.PopularYear, which is why we decided to remove the Sort.PopularYear option from the library (see also: https://github.com/hentai-chan/hentai/pull/144>). If in some shape or form your code depended on that option, replace it Sort.Popular. As far as I know, there is no suitable REST endpoint to retrieve that search option.
Special thanks to https://github.com/ttdyce for submitting a pull request for this issue.