Update ghcr.io/element-hq/ess-helm/matrix-tools Docker tag to v0.5.6

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/element-hq/ess-helm/matrix-tools		patch	0.5.5 -> 0.5.6
ghcr.io/element-hq/ess-helm/matrix-tools	ironbank-docker	patch	0.5.5 -> 0.5.6
ghcr.io/element-hq/ess-helm/matrix-tools	stage	patch	0.5.5 -> 0.5.6

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