Prepare for 2.4 release #1407

Job	Run time
Build Python wheel packages on ubuntu-22.04	4m 34s
build_docs	3m 54s
service-tests (buildbarn)	1m 45s
tests (debian-11)	38m 26s
tests (fedora-40)	30m 28s
service-tests (buildgrid)	3m 30s
tests (fedora-41)	29m 27s
tests (fedora-missing-deps)	17m 54s
tests (ubuntu-22.04)	33m 34s
tests (lint)	1m 45s
tests (mypy)	40s
tests (plugins-master, true)	30m 53s
Test Python packages: wheels-manylinux_2_28-cp39	3m 43s
Test Python packages: wheels-manylinux_2_28-cp310	1m 26s
Test Python packages: wheels-manylinux_2_28-cp311	1m 28s
Test Python packages: wheels-manylinux_2_28-cp312	1m 35s
Test Python packages: wheels-manylinux_2_28-cp313	1m 16s
	3h 26m 18s

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