GHSA-QFV9-64JG-MH7P pypdf: Possible infinite loop in PdfWriter.find_outline_item

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires calling findoutlineitem on a PdfWriter. Patches This has been fixed in pypdf==6.20.1. Workarounds If you cannot upgrade yet, consider applying the changes from PR 4188...