Add Sphinx to Py deps #80

Job	Run time
Build CI container for debian-10-3.9	3m 22s
Build CI container for debian-11-3.10	2m 25s
Build CI container for debian-i386-11-3.10	2m 25s
Build CI container for debian-12-3.10	2m 26s
Build CI container for fedora-37-3.9	1m 39s
Build CI container for fedora-38-3.10	1m 54s
Build CI container for fedora-39-3.10	1m 52s
Build CI container for fedora-40-3.10	1m 22s
Build CI container for ubuntu-18.04-3.8	6m 34s
Build CI container for ubuntu-18.04-3.9	4m 26s
Build CI container for ubuntu-20.04-3.9	2m 59s
Build CI container for ubuntu-22.04-3.9	2m 29s
Build CI container for ubuntu-24.04-3.10	3m 31s
	37m 24s

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