Bug#1055682: gdal b-d's on python3-all-dev, but only builds for the default python version

[Matthias Klose]

see
https://launchpadlibrarian.net/696024489/buildlog_ubuntu-noble-amd64.gdal_3.7.3+dfsg-1_BUILDING.txt.gz

python3-gdal_3.7.3+dfsg-1_amd64.deb doesn't have any extensions for 3.12.