Bump anstream from 0.6.4 to 0.6.20 in /loadgen/kitchen-sink-gen #1786

Job	Run time
build-worker (java)	3m 2s
build-worker (python)	2m 8s
build-ks-gen-and-ensure-protos-up-to-date	1m 7s
check-worker (dotnet)	1m 30s
check-worker (java)	1m 41s
check-worker (python)	1m 6s
test-kitchensink (dotnet)	2m 25s
prepare-for-docker-push	4s
build-cli	2m 16s
test-kitchensink (typescript)	2m 56s
build-worker (typescript)	3m 9s
test-kitchensink (java)	4m 26s
build-worker (go)	1m 47s
check-worker (go)	1m 1s
build-worker (dotnet)	2m 34s
test-kitchensink (go)	2m 17s
test-kitchensink (python)	2m 13s
test-omes	1m 55s
check-worker (typescript)	1m 20s
push-docker-images / build-java-docker-images / Publish java to Docker Hub	17m 56s
push-docker-images / build-typescript-docker-images / Publish typescript to Docker Hub	17m 38s
push-docker-images / build-dotnet-docker-images / Publish dotnet to Docker Hub	14m 46s
push-docker-images / build-go-docker-images / Publish go to Docker Hub	11m 30s
push-docker-images / build-cli-docker-images / Publish CLI to Docker Hub	21m 40s
push-docker-images / build-python-docker-images / Publish python to Docker Hub	12m 55s
	2h 15m 22s

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