maint: drop python 3.8 support #793

Job	Run time
Build Docs	1m 26s
Test Posit Connect	5m 28s
Tests (3.9, ubuntu-latest, --workers 4 --tests-per-worker 1)	1m 24s
Test a fork PR (no secrets)	0s
Tests (3.10, ubuntu-latest, --workers 4 --tests-per-worker 1)	1m 22s
Tests (3.11, ubuntu-latest, --workers 4 --tests-per-worker 1)	1m 23s
Tests (3.12, ubuntu-latest, --workers 4 --tests-per-worker 1)	1m 28s
Tests (3.13, ubuntu-latest, --workers 4 --tests-per-worker 1)	1m 29s
Tests (ubuntu-latest, 3.9, requirements/minimum.txt)	16m 8s
Tests (macos-latest, 3.10, --workers 4 --tests-per-worker 1 -k pins/tests)	3m 6s
Tests (windows-latest, 3.10, -k pins/tests)	17m 45s
Preview Docs:	33s
Release to pypi	0s
Publish Docs	0s
	51m 32s

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