Update quay.io/kiwigrid/k8s-sidecar Docker tag to v1.28.1 (#390)

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

Author: renovate[bot]

hack/config/monitoring/grafana-sidecar/patch_grafana_sidecar.yaml

@@ -9,7 +9,7 @@ spec:
       automountServiceAccountToken: true
       containers:
       - name: grafana-sc-dashboard
-        image: quay.io/kiwigrid/k8s-sidecar:1.28.0
+        image: quay.io/kiwigrid/k8s-sidecar:1.28.1
         imagePullPolicy: IfNotPresent
         env:
         - name: METHOD