MAINT: drop Python 3.8 support #695

Job	Run time
Build pyogrio sdist	9s
Build wheels on Linux (pyogrio-wheel-linux-manylinux2014_x86_64, ci/manylinux2014_x86_64-vcpkg-gd...	5m 7s
Build wheels on Linux (pyogrio-wheel-linux-manylinux_2_28_x86_64, ci/manylinux_2_28_x86_64-vcpkg-...	5m 32s
Build wheels on macos-12 (x86_64)	32m 21s
Build wheels on macos-12 (arm64)	22m 56s
Build wheels on windows-2019 (AMD64)	6m 35s
Test sdist	1m 26s
Test wheels on ubuntu-latest (Python 3.9)	53s
Test wheels on ubuntu-latest (Python 3.10)	47s
Test wheels on ubuntu-latest (Python 3.11)	46s
Test wheels on ubuntu-latest (Python 3.12)	26s
Test wheels on ubuntu-20.04 (Python 3.9)	47s
Test wheels on ubuntu-20.04 (Python 3.10)	55s
Test wheels on ubuntu-20.04 (Python 3.11)	54s
Test wheels on ubuntu-20.04 (Python 3.12)	21s
Test wheels on windows-latest (Python 3.9)	3m 45s
Test wheels on windows-latest (Python 3.10)	3m 1s
Test wheels on windows-latest (Python 3.11)	2m 43s
Test wheels on windows-latest (Python 3.12)	1m 38s
Test wheels on macos-12 (Python 3.9)	1m 17s
Test wheels on macos-12 (Python 3.10)	1m 16s
Test wheels on macos-12 (Python 3.11)	1m 25s
Test wheels on macos-12 (Python 3.12)	33s
Test wheels on macos-latest (Python 3.9)	56s
Test wheels on macos-latest (Python 3.10)	51s
Test wheels on macos-latest (Python 3.11)	1m 3s
Test wheels on macos-latest (Python 3.12)	20s
Publish pyogrio to GitHub / PyPI	0s
	1h 38m 43s

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