feat(helm-chart): update helm release mimir-distributed to 5.1.2

| datasource | package           | from  | to    |
| ---------- | ----------------- | ----- | ----- |
| helm       | mimir-distributed | 5.0.0 | 5.1.2 |


Signed-off-by: Anthony Rabbito <hello@anthonyrabbito.com>

Author: renovate[bot]

k8s/base/monitoring/mimir/helm-release.yaml

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: mimir-distributed
-      version: 5.0.0
+      version: 5.1.2
       sourceRef:
         kind: HelmRepository
         name: grafana-charts