Update gsoci.azurecr.io/giantswarm/k8s-sidecar Docker tag to v2.4.0 (#407)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

helm/grafana/values.yaml

@@ -850,7 +850,7 @@ grafana:
     image:
       registry: gsoci.azurecr.io
       repository: giantswarm/k8s-sidecar
-      tag: 2.3.0
+      tag: 2.4.0
       sha: ""
     imagePullPolicy: IfNotPresent
     resources: {}