ci: update doctest config #92

Job	Run time
doctests	1m 3s
test (ubuntu-latest, x64, lts)	1m 42s
test (ubuntu-latest, x64, nightly)	1m 42s
test (ubuntu-latest, x86, lts)	2m 55s
test (ubuntu-latest, x86, nightly)	2m 38s
test (macos-13, x64, lts)	2m 8s
test (macos-13, x64, nightly)	3m 19s
test (windows-latest, x64, lts)	2m 26s
test (windows-latest, x64, nightly)	2m 27s
test (windows-latest, x86, lts)	3m 40s
test (windows-latest, x86, nightly)	3m 12s
test (macos-latest, aarch64, lts)	1m 38s
test (macos-latest, aarch64, nightly)	2m 10s
	31m 0s

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