Update velero/velero-plugin-for-microsoft-azure Docker tag to v1.6.1

This MR contains the following updates:

Package	Type	Update	Change
velero/velero-plugin-for-microsoft-azure	ironbank-docker	patch	v1.6.0 -> v1.6.1
velero/velero-plugin-for-microsoft-azure		patch	v1.6.0 -> v1.6.1
velero/velero-plugin-for-microsoft-azure	stage	patch	v1.6.0 -> v1.6.1

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