Docs: Update readthedocs config to newer version #1425

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Job	Run time
build (3.6)	42s
build (3.7)	34s
build (3.8)	36s
build (3.9)	1m 48s
build (3.10)	34s
build (3.11)	26s
build (pypy-3.7)	1m 14s
	5m 54s