Update jupyterhub/k8s-image-awaiter Docker tag to v1.2.0

This MR contains the following updates:

Package	Type	Update	Change
jupyterhub/k8s-image-awaiter	ironbank-docker	minor	1.1.4 -> 1.2.0
jupyterhub/k8s-image-awaiter		minor	1.1.4 -> 1.2.0
jupyterhub/k8s-image-awaiter	stage	minor	1.1.4 -> 1.2.0

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