Add missed spec version 1.12 in the sdf_descriptions target (#1529) #77

Job	Run time
test / matrix-prep-bazelversion	6s
test / matrix-prep-os	1s
test / test (ubuntu-latest, 7.3.1, ., true)	3m 23s
test / test (ubuntu-latest, 8.0.0rc1, ., true)	3m 31s
	7m 1s

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