chore: remove Python < 3.9 support (#728) #1587

Job	Run time
build-lint-test (3.9, ubuntu-latest)	12m 33s
build-lint-test (3.9, ubuntu-latest)	12m 33s
build-lint-test (3.9, ubuntu-arm)	8m 45s
build-lint-test (3.9, ubuntu-arm)	8m 45s
build-lint-test (3.9, macos-intel)	11m 29s
build-lint-test (3.9, macos-intel)	11m 29s
build-lint-test (3.9, macos-arm)	4m 59s
build-lint-test (3.9, macos-arm)	4m 59s
build-lint-test (3.9, windows-latest)	13m 15s
build-lint-test (3.9, windows-latest)	13m 15s
build-lint-test (3.13, ubuntu-latest)	11m 32s
build-lint-test (3.13, ubuntu-latest)	11m 32s
build-lint-test (3.13, ubuntu-arm)	9m 2s
build-lint-test (3.13, ubuntu-arm)	9m 11s
build-lint-test (3.13, macos-intel)	12m 56s
build-lint-test (3.13, macos-intel)	12m 56s
build-lint-test (3.13, macos-arm)	5m 58s
build-lint-test (3.13, macos-arm)	5m 58s
build-lint-test (3.13, windows-latest)	15m 56s
build-lint-test (3.13, windows-latest)	15m 56s
features-tests / test	5m 38s
features-tests / test	5m 38s
	3h 44m 15s

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