Update velero/velero-plugin-for-csi Docker tag to v0.6.3

This MR contains the following updates:

Package	Type	Update	Change
velero/velero-plugin-for-csi		patch	v0.6.2 -> v0.6.3
velero/velero-plugin-for-csi	ironbank-docker	patch	v0.6.2 -> v0.6.3
velero/velero-plugin-for-csi	stage	patch	v0.6.2 -> v0.6.3

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