chore(deps): update container image bitnami/alertmanager to 0.27.0@a0b489a by renovate (#20201)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| bitnami/alertmanager | digest | `f4015b5` -> `a0b489a` |

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

@@ -29,7 +29,7 @@ home: https://truecharts.org/charts/premium/prometheus
 icon: https://truecharts.org/img/hotlink-ok/chart-icons/prometheus.png
 keywords:
   - metrics
-kubeVersion: ">=1.24.0-0"
+kubeVersion: '>=1.24.0-0'
 maintainers:
   - name: TrueCharts
     email: info@truecharts.org
@@ -39,8 +39,8 @@ sources:
   - https://github.com/prometheus-community/helm-charts
   - https://github.com/prometheus-operator/kube-prometheus
   - https://github.com/truecharts/charts/tree/master/charts/premium/prometheus
-  - https://quay.io/thanos/thanos
   - https://hub.docker.com/r/bitnami/alertmanager
   - https://hub.docker.com/r/bitnami/prometheus
+  - https://quay.io/thanos/thanos
 type: application
-version: 17.12.8
+version: 17.12.9

charts/premium/prometheus/values.yaml

@@ -6,7 +6,7 @@ thanosImage:
   tag: v0.34.1@sha256:567346c3f6ff2927c2c6c0daad977b2213f62d45eca54d48afd19e6deb902181
 alertmanagerImage:
   repository: bitnami/alertmanager
-  tag: 0.27.0@sha256:f4015b5e8168e904a2a6af549aae79bebef3232ee16661be60dd0adbb722e337
+  tag: 0.27.0@sha256:a0b489a182a2c18c7543a858b1b9d8725b1096c2148a82a1d8e04e8e82ac9fc0
 global:
   labels: {}
 workload: