actions: give up on Python 3.8 testing #1367

Job	Run time
build (ubuntu-20.04, 1, build, x86_64)	4m 41s
build (ubuntu-20.04, 1, build, x86_64)	7m 15s
build (macos-12, 2, build, x86_64)	4m 41s
build (macos-12, 2, build, x86_64)	8m 47s
build (self-hosted, macOS, ARM64, 3, build, aarch64)	1s
build (self-hosted, macOS, ARM64, 3, build, aarch64)	14m 34s
build (windows-2022, 4, build, Win64)	4m 30s
build (windows-2022, 4, build, Win64)	9m 4s
build (self-hosted, linux, arm64, 5, build, aarch64)	1s
build (self-hosted, linux, arm64, 5, build, aarch64)	1h 41m 30s
build (ubuntu-22.04, test, 3.9, 7)	4m 35s
build (ubuntu-22.04, test, 3.9, 7)	4m 56s
build (ubuntu-22.04, test, 3.10, 8)	4m 25s
build (ubuntu-22.04, test, 3.10, 8)	4m 56s
build (ubuntu-22.04, test, 3.11, 9)	4m 41s
build (ubuntu-22.04, test, 3.11, 9)	4m 56s
	3h 3m 33s

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