Update ghcr.io/appgate/sdp-k8s-injector/sdp-injector Docker tag to v1.0.8

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/appgate/sdp-k8s-injector/sdp-injector	ironbank-docker	patch	1.0.7 -> 1.0.8
ghcr.io/appgate/sdp-k8s-injector/sdp-injector		patch	1.0.7 -> 1.0.8
ghcr.io/appgate/sdp-k8s-injector/sdp-injector	stage	patch	1.0.7 -> 1.0.8

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