chore(deps): update helm release grafana to v10.2.0 (#1613)

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

Author: renovate[bot]

kustomize/bases/grafana/kustomization.yaml

@@ -5,7 +5,7 @@ namespace: observability
 helmCharts:
   - name: grafana
     repo: https://grafana.github.io/helm-charts
-    version: 10.1.4
+    version: 10.2.0
     releaseName: grafana
     namespace: observability
     valuesFile: helm-values.yaml