build(deps): bump opentelemetry-sdk from 1.20.0 to 1.21.0 in /utils/tracing/python #905

Job	Run time
Build and push all images (geo)	4m 17s
Build and push all images (profile)	9m 8s
Build and push all images (rate)	7m 39s
Build and push all images (recommendation)	7m 51s
Build and push all images (reservation)	8m 30s
Build and push all images (user)	5m 19s
Build and push all images (search)	4m 11s
Test Docker Compose (geo)	1m 18s
Test Docker Compose (geo-tracing)	1m 27s
Test Knative Deployment (hotel-app-geo, kn-geo.yaml)	3m 39s
Test Docker Compose (profile)	1m 18s
Test Knative Deployment (hotel-app-geo-tracing, kn-geo-tracing.yaml)	2m 52s
Test Docker Compose (rate)	1m 24s
Test Knative Deployment (hotel-app-profile, kn-profile.yaml)	2m 4s
Test Docker Compose (recommendation)	1m 24s
Test Knative Deployment (hotel-app-rate, kn-rate.yaml)	2m 51s
Test Docker Compose (reservation)	1m 22s
Test Knative Deployment (hotel-app-recommendation, kn-recommendation.yaml)	2m 44s
Test Docker Compose (user)	1m 12s
Test Knative Deployment (hotel-app-reservation, kn-reservation.yaml)	2m 6s
Test Docker Compose (search)	1m 23s
Test Knative Deployment (hotel-app-user, kn-user.yaml)	2m 11s
Test Docker Compose (search-tracing)	1m 17s
Test Knative Deployment (hotel-app-search, kn-search.yaml)	2m 45s
Test Knative Deployment (hotel-app-search-tracing, kn-search-tracing.yaml)	2m 17s
	1h 22m 29s

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