chore(deps): update helm release grafana to v6.59.5

Author: renovate[bot]

apps/grafana/base/kustomization.yaml

@@ -5,7 +5,7 @@ helmCharts:
   - name: grafana
     includeCRDs: true
     releaseName: grafana
-    version: 6.57.2
+    version: 6.59.5
     repo: https://grafana.github.io/helm-charts
     valuesInline:
       fullnameOverride: grafana