update cs248 #281

Job	Run time
ucvm-build-cvmh-taper (3.7)	26m 4s
ucvm-build-cvms-cvmh (3.7)	28m 18s
ucvm-build-albacore-cvlsu-ivlsu-wfcvm (3.7)	27m 20s
	1h 21m 42s

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