MAINT: drop Python 3.8 support #696

Job	Run time
Build pyogrio sdist	12s
Build wheels on Linux (pyogrio-wheel-linux-manylinux2014_x86_64, ci/manylinux2014_x86_64-vcpkg-gd...	21m 3s
Build wheels on Linux (pyogrio-wheel-linux-manylinux_2_28_x86_64, ci/manylinux_2_28_x86_64-vcpkg-...	5m 38s
Build wheels on macos-12 (x86_64)	24m 8s
Build wheels on macos-12 (arm64)	20m 10s
Build wheels on windows-2019 (AMD64)	5m 9s
Test sdist	1m 32s
Test wheels on ubuntu-latest (Python 3.9)	57s
Test wheels on ubuntu-latest (Python 3.10)	50s
Test wheels on ubuntu-latest (Python 3.11)	46s
Test wheels on ubuntu-latest (Python 3.12)	29s
Test wheels on ubuntu-20.04 (Python 3.9)	57s
Test wheels on ubuntu-20.04 (Python 3.10)	51s
Test wheels on ubuntu-20.04 (Python 3.11)	50s
Test wheels on ubuntu-20.04 (Python 3.12)	21s
Test wheels on windows-latest (Python 3.9)	3m 26s
Test wheels on windows-latest (Python 3.10)	2m 39s
Test wheels on windows-latest (Python 3.11)	2m 36s
Test wheels on windows-latest (Python 3.12)	59s
Test wheels on macos-12 (Python 3.9)	1m 27s
Test wheels on macos-12 (Python 3.10)	1m 27s
Test wheels on macos-12 (Python 3.11)	1m 20s
Test wheels on macos-12 (Python 3.12)	40s
Test wheels on macos-latest (Python 3.9)	1m 0s
Test wheels on macos-latest (Python 3.10)	54s
Test wheels on macos-latest (Python 3.11)	1m 6s
Test wheels on macos-latest (Python 3.12)	20s
Publish pyogrio to GitHub / PyPI	0s
	1h 41m 47s

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