Update ghcr.io/appgate/sdp-k8s-injector/sdp-identity-service Docker tag to v1.2.6

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/appgate/sdp-k8s-injector/sdp-identity-service	ironbank-docker	patch	1.2.5 -> 1.2.6
ghcr.io/appgate/sdp-k8s-injector/sdp-identity-service	stage	patch	1.2.5 -> 1.2.6

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