This package does not support Python 3.12. Please test it with Python 3.12 as a matter of urgency as the default will change in early June, as per message on gentoo-dev: https://www.mail-archive.com/gentoo-dev@lists.gentoo.org/msg99104.html. Please check the information provided in the tracker. Ask in #gentoo-python on IRC if need any help.
Unlikely to happen before 24.05.0, while current dev-util/kdevelop-24.02.2 is still depending on dev-qt/qtwebengine:5 which is a much bigger package not having python3_12 support as well.