Update gcr.io/kasten-images/emissary Docker tag to v7.0.13

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kasten-images/emissary		patch	7.0.12 -> 7.0.13
gcr.io/kasten-images/emissary	ironbank-docker	patch	7.0.12 -> 7.0.13
gcr.io/kasten-images/emissary	stage	patch	7.0.12 -> 7.0.13

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