Tests

FIXUP: fix colorsplace in pixels_to_pdf #1928

Job	Run time
macOS	2m 38s
windows	5m 48s
build-deb	19m 53s
install-deb (ubuntu-20.04, ubuntu, 20.04)	2m 29s
install-deb (ubuntu-22.04, ubuntu, 22.04)	2m 16s
install-deb (ubuntu-23.04, ubuntu, 23.04)	2m 23s
install-deb (ubuntu-23.10, ubuntu, 23.10)	2m 14s
install-deb (debian-bullseye, debian, bullseye)	2m 21s
install-deb (debian-bookworm, debian, bookworm)	2m 20s
install-deb (debian-trixie, debian, trixie)	2m 11s
	44m 33s

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