Update velero/velero-plugin-for-microsoft-azure Docker tag to v1.7.0

This MR contains the following updates:

Package	Type	Update	Change
velero/velero-plugin-for-microsoft-azure	ironbank-docker	minor	v1.6.1 -> v1.7.0
velero/velero-plugin-for-microsoft-azure		minor	v1.6.1 -> v1.7.0
velero/velero-plugin-for-microsoft-azure	stage	minor	v1.6.1 -> v1.7.0

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