chore(common): update image ghcr.io/cloudnative-pg/postgresql digest to 4c1d5af (#44626)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ghcr.io/cloudnative-pg/postgresql | digest | `0451cd9` → `4c1d5af` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

Add the preset `:preserveSemverRanges` to your config if you don't want
to pin your dependencies.

---

### Configuration

📅 **Schedule**: Branch creation - "on the first day of the month" (UTC),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Renovate
Bot](https://redirect.github.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My40LjAiLCJ1cGRhdGVkSW5WZXIiOiI0My40LjAiLCJ0YXJnZXRCcmFuY2giOiJtYXN0ZXIiLCJsYWJlbHMiOlsiYXBwL2NvbW1vbiIsImF1dG9tZXJnZSIsInJlbm92YXRlL2NvbnRhaW5lciIsInR5cGUvZGlnZXN0Il19-->

charts/library/common/values.yaml

@@ -644,7 +644,7 @@ mongodbClientImage:
 
 postgres15Image:
   repository: ghcr.io/cloudnative-pg/postgresql
-  tag: "15.15@sha256:0451cd9181b66273a697738b6dd1d0258a5385dfd1c5d6d372b7fba5ed59f3d2"
+  tag: "15.15@sha256:4c1d5afdd4f735ff1328cbe39758f4b107a005937dd04183102e278b17b8b4c4"
   pullPolicy: IfNotPresent
 
 postgres16Image: