Update ghcr.io/loft-sh/vcluster Docker tag to v0.20.1

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/loft-sh/vcluster		patch	0.20.0 -> 0.20.1
ghcr.io/loft-sh/vcluster	ironbank-docker	patch	0.20.0 -> 0.20.1
ghcr.io/loft-sh/vcluster	stage	patch	0.20.0 -> 0.20.1

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