Merge pull request #2797 from tuxpeople/renovate/thanos-15.x

feat(container): update image thanos to v15.12.2

Author: tuxpeople

kubernetes/apps/observability/thanos/app/helmrelease.yaml

@@ -9,7 +9,7 @@ spec:
   chart:
     spec:
       chart: thanos
-      version: 15.9.2
+      version: 15.12.2
       sourceRef:
         kind: HelmRepository
         name: bitnami