Update golang.org/x/exp digest to dc181d7 (#30096) #13

Job	Run time
windows-unittest-matrix (receiver-0)	19m 44s
windows-unittest-matrix (receiver-1)	23m 8s
windows-unittest-matrix (processor)	19m 26s
windows-unittest-matrix (exporter)	32m 15s
windows-unittest-matrix (extension)	14m 1s
windows-unittest-matrix (internal)	16m 36s
windows-unittest-matrix (pkg)	16m 52s
windows-unittest-matrix (cmd)	32m 10s
windows-unittest-matrix (other)	19m 18s
windows-unittest	2s
	3h 13m 32s

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