Dear maintainers,

dh-cmake is a key package as it is needed to build many usefull packages.

thing like python3-pyflakes that is only (sometimes unwisely)
used to run test should not be a key_package

Please mark appropriate dependencies as <!nocheck>

https://release.debian.org/key-packages.html
https://wiki.debian.org/qa.debian.org/FTBFS/nocheck

Greetings

Alexandre