Update hashicorp/vault-k8s Docker tag to v0.7.0

This MR contains the following updates:

Package	Type	Update	Change
hashicorp/vault-k8s	ironbank-docker	minor	0.6.0 -> 0.7.0
hashicorp/vault-k8s		minor	0.6.0 -> 0.7.0
hashicorp/vault-k8s	stage	minor	0.6.0 -> 0.7.0

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