build(deps): bump golang.org/x/net in /tools/knative-eventing-tutorial #1012

Job	Run time
Build and push all images (auth-go)	1m 43s
Build and push all images (auth-python)	1m 13s
Build and push all images (auth-nodejs)	1m 10s
Build and push all images (auth-python-lambda)	1m 22s
Build and push all images (auth-nodejs-lambda)	1m 40s
Build and push all images (auth-go-lambda)	1m 19s
Test Knative Deployment (auth-go)	1m 58s
Test AWS Lambda Deployment (auth-python-lambda)	1m 5s
Test Knative Deployment (auth-python)	2m 6s
Test Docker Compose (auth-go)	1m 8s
Test AWS Lambda Deployment (auth-nodejs-lambda)	1m 8s
Test Knative Deployment (auth-nodejs)	2m 14s
Test Docker Compose (auth-python)	1m 10s
Test AWS Lambda Deployment (auth-go-lambda)	1m 5s
Test Knative Deployment (auth-go-tracing)	2m 4s
Test Docker Compose (auth-nodejs)	1m 12s
Test Knative Deployment (auth-python-tracing)	2m 15s
Test Docker Compose (auth-go-tracing)	1m 17s
Test Knative Deployment (auth-nodejs-tracing)	2m 31s
Test Docker Compose (auth-python-tracing)	1m 12s
Test Docker Compose (auth-nodejs-tracing)	1m 15s
	32m 7s

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