chore(deps): update helm release thanos to v12.23.0

This MR contains the following updates:

Package	Update	Change
thanos (source)	minor	12.20.1 -> 12.23.0

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k8s/clusters/apps/monitoring/observer.yml

@@ -347,7 +347,7 @@ spec:
       source:
         repoURL: https://charts.bitnami.com/bitnami
         chart: thanos
-        targetRevision: 12.20.1
+        targetRevision: 12.23.0
         helm:
           values: |
             fullnameOverride: thanos-{{observeeName}}
@@ -421,7 +421,7 @@ spec:
       source:
         repoURL: https://charts.bitnami.com/bitnami
         chart: thanos
-        targetRevision: 12.20.1
+        targetRevision: 12.23.0
         helm:
           values: |
             fullnameOverride: thanos-query-{{observeeName}}
@@ -474,7 +474,7 @@ spec:
       source:
         repoURL: https://charts.bitnami.com/bitnami
         chart: thanos
-        targetRevision: 12.20.1
+        targetRevision: 12.23.0
         helm:
           values: |
             fullnameOverride: thanos-query