Update gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/webhook:v0.20.1 Docker digest to 34b74ab

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/webhook	ironbank-docker	digest	4870880 -> 34b74ab

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