[chore][cmd/telemetrygen] Fix deprecated method usage (#32300) #75947

Job	Run time
windows-unittest-matrix (receiver-0)	11m 39s
windows-unittest-matrix (receiver-1)	11m 38s
windows-unittest-matrix (processor)	11m 40s
windows-unittest-matrix (exporter)	11m 40s
windows-unittest-matrix (extension)	11m 40s
windows-unittest-matrix (internal)	11m 41s
windows-unittest-matrix (pkg)	11m 26s
windows-unittest-matrix (cmd)	11m 40s
windows-unittest-matrix (other)	11m 42s
windows-unittest	0s
	1h 44m 46s

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