Bump google.golang.org/api from 0.79.0 to 0.150.0 in /exporter/googlecloudpubsubexporter #8573

Job	Run time
setup-environment	8m 52s
loadtest (TestIdleMode)	2m 10s
loadtest (TestBallastMemory\|TestLog10kDPS)	5m 24s
loadtest (TestMetric10kDPS\|TestMetricsFromFile)	3m 8s
loadtest (TestMetricResourceProcessor\|TestTrace10kSPS)	5m 20s
loadtest (TestTraceNoBackend10kSPS\|TestTrace1kSPSWithAttrs)	4m 56s
loadtest (TestTraceBallast1kSPSWithAttrs\|TestTraceBallast1kSPSAddAttrs)	4m 35s
loadtest (TestTraceAttributesProcessor)	1m 52s
	36m 17s

Provide feedback