chore(deps): update pgo docker tag to v5.6.0 (#161)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| pgo | minor | `5.5.2` -> `5.6.0` |

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cluster/apps/operators/crunchy-postgres-operator/helm-release.yaml

@@ -9,7 +9,7 @@ spec:
   chart:
     spec:
       chart: pgo
-      version: 5.5.2
+      version: 5.6.0
       sourceRef:
         kind: HelmRepository
         name: crunchydata