feat(common): update image ghcr.io/cloudnative-pg/postgresql 15.17 → 15.18 (#48444)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ghcr.io/cloudnative-pg/postgresql | minor | `23d56b4` → `eb5bc75` |

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charts/library/common/Chart.yaml

@@ -45,5 +45,4 @@ sources:
   - https://github.com/trueforge-org/truecharts/tree/master/charts/library/common
   - https://hub.docker.com/_/
 type: library
-version: 29.3.5
-
+version: 29.4.0

charts/library/common/values.yaml

@@ -643,7 +643,7 @@ mongodbClientImage:
 
 postgres15Image:
   repository: ghcr.io/cloudnative-pg/postgresql
-  tag: "15.17@sha256:9e197ea13fe53dd85b3870cca114c2ce2b07d8038d4526069be24b83b8687bc4"
+  tag: "15.18@sha256:eb5bc7579ff2aa5ba3072247ba6dde52f0af9ac015f34a83e54b36beec27bdf7"
   pullPolicy: IfNotPresent
 
 postgres16Image: