Add dummy hash for `AbsIdealSheaf` #17723

Job	Run time
doctest (1.10, ubuntu-latest)	30m 7s
doctest (1.11-nightly, ubuntu-latest)	29m 37s
doctest (nightly, ubuntu-latest)	28m 45s
doctest (1.10, ubuntu-latest, depwarn=error)	30m 7s
test (1.6, short, ubuntu-latest)	1h 34m 23s
doctest (1.10, macOS, RPTU)	15m 4s
test (1.6, long, ubuntu-latest)	57m 30s
test (1.10, short, ubuntu-latest)	1h 8m 23s
test (1.10, long, ubuntu-latest)	46m 6s
test (1.11-nightly, short, ubuntu-latest)	1h 23m 51s
test (1.11-nightly, long, ubuntu-latest)	52m 56s
test (nightly, short, ubuntu-latest)	1h 23m 0s
test (nightly, long, ubuntu-latest)	54m 11s
test (1.10, short, ubuntu-latest, depwarn=error)	1h 9m 53s
test (1.10, long, ubuntu-latest, depwarn=error)	46m 11s
test (1.10, short, macOS, RPTU)	15m 21s
test (1.10, long, macOS, RPTU)	12m 13s
test (1.10, book, ubuntu-latest)	47m 46s
test (nightly, book, ubuntu-latest)	59m 37s
	15h 25m 1s

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