Bump docutils from 0.19 to 0.20.1 #698

Job	Run time
lint	40s
cleanup_buckets	2s
build	43s
test (ubuntu-latest, 3.7)	56s
test (ubuntu-latest, 3.8)	54s
test (ubuntu-latest, 3.9)	1m 5s
test (ubuntu-latest, 3.10)	54s
test (ubuntu-latest, 3.11)	52s
test (ubuntu-latest, 3.12-dev)	1m 16s
test (ubuntu-latest, pypy-3.10)	3m 4s
test (macos-latest, 3.7)	1m 26s
test (macos-latest, 3.8)	1m 28s
test (macos-latest, 3.9)	1m 36s
test (macos-latest, 3.10)	1m 27s
test (macos-latest, 3.11)	1m 47s
test (windows-latest, 3.7)	2m 15s
test (windows-latest, 3.8)	2m 7s
test (windows-latest, 3.9)	3m 2s
test (windows-latest, 3.10)	2m 0s
test (windows-latest, 3.11)	1m 48s
test-docker	8s
test-linux-bundle	1m 38s
test-windows-bundle (windows-2019)	2m 53s
test-windows-bundle (windows-latest)	2m 39s
doc	1m 29s
	38m 9s

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