chore(common): update image ghcr.io/cloudnative-pg/postgresql digest to a5da0dc (#49713)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ghcr.io/cloudnative-pg/postgresql | digest | `8c0bc71` → `a5da0dc` |

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charts/library/common/Chart.yaml

@@ -46,4 +46,3 @@ sources:
   - https://hub.docker.com/_/
 type: library
 version: 29.6.2
-

charts/library/common/values.yaml

@@ -648,7 +648,7 @@ postgres15Image:
 
 postgres16Image:
   repository: ghcr.io/cloudnative-pg/postgresql
-  tag: "16.14@sha256:8c0bc715bff42162c1a7da081c93e3d081d16218e0d0d16ffaf83da7f286876d"
+  tag: "16.14@sha256:a5da0dc248c87de7595b8215fc1e6c3b0fee2ac7307b98e9dbb142f456bc7958"
   pullPolicy: IfNotPresent
 
 postgresPostgis15Image: