Update gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/pullrequest-init digest to e72aa3a

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/pullrequest-init	ironbank-docker	digest	b99eb60 -> e72aa3a

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