booktests: fix version spec for pkg add to allow patch releases #16631

Job	Run time
doctest (1.10, ubuntu-latest)	26m 42s
test (1.6, short, ubuntu-latest)	1h 28m 54s
doctest (1.11-nightly, ubuntu-latest)	25m 57s
test (1.6, long, ubuntu-latest)	58m 2s
doctest (nightly, ubuntu-latest)	28m 39s
test (1.10, short, ubuntu-latest)	1h 11m 9s
doctest (1.10, ubuntu-latest, depwarn=error)	27m 3s
test (1.10, long, ubuntu-latest)	46m 15s
doctest (1.10, macOS, RPTU)	13m 9s
test (1.11-nightly, short, ubuntu-latest)	1h 20m 49s
test (1.11-nightly, long, ubuntu-latest)	52m 41s
test (nightly, short, ubuntu-latest)	1h 22m 44s
test (nightly, long, ubuntu-latest)	52m 49s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 11m 30s
test (1.10, long, ubuntu-latest, depwarn=error)	45m 17s
test (1.10, short, macOS, RPTU)	14m 23s
test (1.10, long, macOS, RPTU)	14m 41s
test (1.10, book, ubuntu-latest)	55m 16s
	14h 16m 0s

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