Un-pin flake8 #67

Job	Run time
canary / setup	8s
canary / pytest (macos-latest, 3.7)	1m 4s
canary / pytest (macos-latest, 3.8)	1m 0s
canary / pytest (macos-latest, 3.9)	55s
canary / pytest (macos-latest, 3.10)	56s
canary / pytest (macos-latest, 3.11)	1m 3s
canary / pytest (macos-latest, 3.12)	1m 11s
canary / pytest (ubuntu-latest, 3.7)	3m 51s
canary / pytest (ubuntu-latest, 3.8)	1m 21s
canary / pytest (ubuntu-latest, 3.9)	3m 23s
canary / pytest (ubuntu-latest, 3.10)	2m 54s
canary / pytest (ubuntu-latest, 3.11)	3m 0s
canary / pytest (ubuntu-latest, 3.12)	3m 9s
canary / pytest (windows-latest, 3.7)	1m 48s
canary / pytest (windows-latest, 3.8)	1m 34s
canary / pytest (windows-latest, 3.9)	1m 56s
canary / pytest (windows-latest, 3.10)	1m 39s
canary / pytest (windows-latest, 3.11)	1m 50s
canary / pytest (windows-latest, 3.12)	1m 26s
canary / pytest (ubuntu-20.04, 3.6)	32s
	34m 40s

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