chore: Upgrade project to Python 3.8 #11473

Job	Run time
danger-check	23s
cfn-lint	32s
dogfood-tests	4m 44s
integration-tests (3.8, ubuntu-latest)	3m 1s
performance-tests	2m 35s
integration-tests (3.8, macos-latest)	3m 26s
unit-tests (3.7)	3m 59s
integration-tests (3.8, windows-latest)	4m 28s
unit-tests (3.8)	4m 44s
integration-tests (3.9, ubuntu-latest)	3m 2s
unit-tests (3.9)	3m 38s
integration-tests (3.9, macos-latest)	3m 28s
unit-tests (3.10)	4m 38s
integration-tests (3.9, windows-latest)	5m 0s
unit-tests (3.11)	4m 22s
integration-tests (3.10, ubuntu-latest)	3m 12s
integration-tests (3.10, macos-latest)	5m 54s
integration-tests (3.10, windows-latest)	5m 23s
integration-tests (3.11, ubuntu-latest)	3m 1s
integration-tests (3.11, macos-latest)	3m 19s
integration-tests (3.11, windows-latest)	7m 23s
lint / pre-commit	45s
mypy / mypy	34s
	1h 21m 31s

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