Disable version 3.9 as EOL (#275) #598

Job	Run time
sync / sync	4m 34s
check / Build docs (epub)	6m 36s
check / Build docs (latex)	6m 2s
check / Build docs (html)	6m 47s
check / Lint translations	59s
check / Check for zero-width space characters	36s
check / Build docs (pdf)	-1s
	25m 33s

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