ci: update doctest config (#120) #93

Job	Run time
doctests	1m 5s
test (ubuntu-latest, x64, lts)	1m 34s
test (ubuntu-latest, x64, nightly)	1m 47s
test (ubuntu-latest, x86, lts)	2m 54s
test (ubuntu-latest, x86, nightly)	2m 37s
test (macos-13, x64, lts)	1m 52s
test (macos-13, x64, nightly)	4m 4s
test (windows-latest, x64, lts)	2m 4s
test (windows-latest, x64, nightly)	2m 16s
test (windows-latest, x86, lts)	3m 45s
test (windows-latest, x86, nightly)	3m 17s
test (macos-latest, aarch64, lts)	1m 35s
test (macos-latest, aarch64, nightly)	1m 51s
	30m 41s

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