Bump to 20.5 #75

Job	Run time
qa	12s
build (3.9, no-gpg)	35s
build (3.9, vanilla-gpg)	1m 45s
build (3.9, -norequests-noresponses, no-gpg)	29s
build (3.9, -norequests-noresponses, vanilla-gpg)	1m 43s
build (3.9, -noresponses, no-gpg)	37s
build (3.9, -noresponses, vanilla-gpg)	2m 2s
build (3.10, no-gpg)	1m 45s
build (3.10, vanilla-gpg)	2m 11s
build (3.10, -norequests-noresponses, no-gpg)	41s
build (3.10, -norequests-noresponses, vanilla-gpg)	2m 15s
build (3.10, -noresponses, no-gpg)	43s
build (3.10, -noresponses, vanilla-gpg)	1m 46s
build (3.11, no-gpg)	37s
build (3.11, vanilla-gpg)	1m 51s
build (3.11, -norequests-noresponses, no-gpg)	31s
build (3.11, -norequests-noresponses, vanilla-gpg)	2m 11s
build (3.11, -noresponses, no-gpg)	1m 4s
build (3.11, -noresponses, vanilla-gpg)	1m 46s
build (3.12-dev, no-gpg)	1m 26s
build (3.12-dev, vanilla-gpg)	3m 13s
build (3.12-dev, -norequests-noresponses, no-gpg)	1m 16s
build (3.12-dev, -norequests-noresponses, vanilla-gpg)	1m 58s
build (3.12-dev, -noresponses, no-gpg)	1m 15s
build (3.12-dev, -noresponses, vanilla-gpg)	2m 6s
build (pypy-3.9, no-gpg)	1m 30s
build (pypy-3.9, vanilla-gpg)	3m 47s
build (pypy-3.9, -norequests-noresponses, no-gpg)	1m 43s
build (pypy-3.9, -norequests-noresponses, vanilla-gpg)	3m 33s
build (pypy-3.9, -noresponses, no-gpg)	1m 6s
build (pypy-3.9, -noresponses, vanilla-gpg)	3m 32s
	51m 9s

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