build

Bump version: 3.7.20 → 3.7.21 #1109

Job	Run time
check	43s
docs	54s
py38 (ubuntu)	5m 40s
py39 (ubuntu)	5m 29s
py39 (windows)	6m 57s
py310 (ubuntu)	6m 7s
py310 (windows)	7m 11s
py311 (ubuntu)	5m 29s
py311 (macos)	5m 25s
py311 (windows)	7m 24s
Deploy docs to GitHub Pages	0s
Upload coverage to Coveralls	0s
	51m 19s

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