Bump go.opentelemetry.io/otel/exporters/zipkin from 1.8.0 to 1.18.0 in /utils/tracing/go #747

Job	Run time
Build and push all images (geo)	1m 43s
Build and push all images (profile)	1m 18s
Build and push all images (rate)	1m 36s
Build and push all images (recommendation)	1m 20s
Build and push all images (reservation)	1m 19s
Build and push all images (user)	1m 26s
Build and push all images (search)	1m 23s
Test Knative Deployment	0s
Test Docker Compose	0s
	10m 5s

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