Disable version 3.9 as EOL (#275) #249

Job	Run time
sync / sync	2m 52s
check / Lint translations	1m 45s
check / Build docs (latex)	7m 59s
check / Build docs (html)	7m 30s
check / Build docs (epub)	7m 26s
check / Check for zero-width space characters	30s
check / Build docs (pdf)	0s
	28m 2s

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