DOC: Patch doc/conf.py to work with latest ReadTheDocs #1107

Job	Run time
build	28s
stable (ubuntu-22.04, 3.9, test, REQUIREMENTS, false, doc,tests,profiler)	2m 49s
stable (ubuntu-22.04, 3.10, test, REQUIREMENTS, false, doc,tests,profiler)	2m 51s
stable (ubuntu-22.04, 3.11, test, REQUIREMENTS, false, doc,tests,profiler)	2m 52s
stable (ubuntu-22.04, 3.12, test, REQUIREMENTS, false, doc,tests,profiler)	2m 48s
stable (ubuntu-22.04, 3.9, test, REQUIREMENTS, true, doc,tests,profiler,duecredit,ssh)	2m 48s
stable (ubuntu-20.04, 3.9, test, REQUIREMENTS, true, doc,tests,nipy,profiler,duecredit,ssh)	2m 52s
test-package (wheel)	2m 4s
test-package (sdist)	2m 4s
publish	1s
	21m 37s

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