feat(helm): update chart loki to 6.21.0

[renovate]

This PR contains the following updates:

Package	Update	Change
loki (source)	minor	6.19.0 -> 6.21.0

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[github-actions]

--- kubernetes/apps/observability/loki/app Kustomization: flux-system/loki HelmRelease: observability/loki

+++ kubernetes/apps/observability/loki/app Kustomization: flux-system/loki HelmRelease: observability/loki

@@ -13,13 +13,13 @@

     spec:
       chart: loki
       sourceRef:
         kind: HelmRepository
         name: grafana
         namespace: flux-system
-      version: 6.19.0
+      version: 6.21.0
   dependsOn:
   - name: openebs
     namespace: openebs-system
   install:
     crds: Skip
     remediation:

[github-actions]

--- HelmRelease: observability/loki StatefulSet: observability/loki

+++ HelmRelease: observability/loki StatefulSet: observability/loki

@@ -42,13 +42,13 @@

         runAsGroup: 10001
         runAsNonRoot: true
         runAsUser: 10001
       terminationGracePeriodSeconds: 30
       containers:
       - name: loki-sc-rules
-        image: kiwigrid/k8s-sidecar:1.27.5
+        image: kiwigrid/k8s-sidecar:1.28.0
         imagePullPolicy: IfNotPresent
         env:
         - name: METHOD
           value: WATCH
         - name: LABEL
           value: loki_rule
@@ -63,13 +63,13 @@

         - name: LOG_LEVEL
           value: INFO
         volumeMounts:
         - name: sc-rules-volume
           mountPath: /rules
       - name: loki
-        image: docker.io/grafana/loki:3.2.0
+        image: docker.io/grafana/loki:3.3.0
         imagePullPolicy: IfNotPresent
         args:
         - -config.file=/etc/loki/config/config.yaml
         - -target=all
         ports:
         - name: http-metrics