Drop support for EOL Python 3.8 #69

Job	Run time
test (macos-latest, 3.9, py39)	19s
test (macos-latest, 3.10, py310)	16s
test (macos-latest, 3.11, py311)	17s
test (macos-latest, 3.12, py312)	21s
test (macos-latest, pypy3.9, pypy39)	36s
test (macos-latest, pypy3.10, pypy310)	50s
test (windows-latest, 3.9, py39)	45s
test (windows-latest, 3.10, py310)	39s
test (windows-latest, 3.11, py311)	35s
test (windows-latest, 3.12, py312)	49s
test (windows-latest, pypy3.9, pypy39)	1m 49s
test (windows-latest, pypy3.10, pypy310)	1m 49s
test (ubuntu-latest, 3.9, py39)	15s
test (ubuntu-latest, 3.10, py310)	24s
test (ubuntu-latest, 3.11, py311)	20s
test (ubuntu-latest, 3.12, py312)	15s
test (ubuntu-latest, pypy3.9, pypy39)	35s
test (ubuntu-latest, pypy3.10, pypy310)	31s
test (ubuntu-latest, 3.9, codestyle)	11s
test (ubuntu-latest, 3.9, lint)	12s
test (ubuntu-latest, 3.9, typecheck)	19s
	12m 7s

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