feat(container): update image pgo to v5.6.1

[renovate]

This PR contains the following updates:

Package	Update	Change
pgo	minor	5.5.0 -> 5.6.1

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[github-actions]

--- kubernetes/apps/database/crunchy-postgres-operator/operator Kustomization: flux-system/crunchy-postgres-operator HelmRelease: flux-system/crunchy-postgres-operator

+++ kubernetes/apps/database/crunchy-postgres-operator/operator Kustomization: flux-system/crunchy-postgres-operator HelmRelease: flux-system/crunchy-postgres-operator

@@ -9,13 +9,13 @@

       chart: pgo
       interval: 5m
       sourceRef:
         kind: HelmRepository
         name: crunchydata
         namespace: flux-system
-      version: 5.5.0
+      version: 5.6.1
   install:
     crds: CreateReplace
   interval: 30m
   upgrade:
     crds: CreateReplace