fix(container): update image thanos to v15.7.20

[k3s-home-gha-bot]

This PR contains the following updates:

Package	Update	Change
thanos (source)	patch	15.7.19 -> 15.7.20

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Release Notes

bitnami/charts (thanos)

v15.7.20

• [bitnami/thanos] Release 15.7.20 (#​28859)

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[github-actions]

--- kubernetes/apps/observability/thanos/app Kustomization: flux-system/thanos HelmRelease: observability/thanos

+++ kubernetes/apps/observability/thanos/app Kustomization: flux-system/thanos HelmRelease: observability/thanos

@@ -13,13 +13,13 @@

     spec:
       chart: thanos
       sourceRef:
         kind: HelmRepository
         name: bitnami
         namespace: flux-system
-      version: 15.7.19
+      version: 15.7.20
   dependsOn:
   - name: local-path-provisioner
     namespace: storage
   - name: dragonfly-operator
     namespace: database
   install: