chore(deps): update container image bitnami/alertmanager to 0.27.0@57a0900 by renovate (#25579)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [bitnami/alertmanager](https://togithub.com/bitnami/containers)
([source](https://togithub.com/bitnami/containers/tree/HEAD/bitnami/alertmanager))
| digest | `a15427d` -> `57a0900` |

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This PR has been generated by [Renovate
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charts/premium/prometheus/Chart.yaml

@@ -42,4 +42,4 @@ sources:
   - https://hub.docker.com/r/bitnami/prometheus
   - https://quay.io/thanos/thanos
 type: application
-version: 19.13.0
+version: 19.13.1

charts/premium/prometheus/values.yaml

@@ -6,7 +6,7 @@ thanosImage:
   tag: v0.36.1@sha256:e542959e1b36d5046083d1b64a7049c356b68a44a173c58b3ae7c0c9ada932d5
 alertmanagerImage:
   repository: bitnami/alertmanager
-  tag: 0.27.0@sha256:a15427d94ec3a7458b7d98e1c1d20099bb4fd5e8d9ff75428417f9791c153186
+  tag: 0.27.0@sha256:57a0900204eb177a6c9c83e14c6cfd933dbbad6a6a79aee9dc526e85226ed6ef
 global:
   labels: {}
 workload: