Update gcr.io/tekton-releases/github.com/tektoncd/triggers/cmd/interceptors Docker tag to v0.15.2

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/tekton-releases/github.com/tektoncd/triggers/cmd/interceptors	ironbank-docker	patch	v0.15.1 -> v0.15.2
gcr.io/tekton-releases/github.com/tektoncd/triggers/cmd/interceptors		patch	v0.15.1 -> v0.15.2
gcr.io/tekton-releases/github.com/tektoncd/triggers/cmd/interceptors	stage	patch	v0.15.1 -> v0.15.2

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