Update gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/imagedigestexporter:v0.23.0 Docker digest to 8e0dc78

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/imagedigestexporter	ironbank-docker	digest	5650b03 -> 8e0dc78

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