chore(deps): update quay.io/prometheuscommunity/postgres-exporter docker tag to v0.15.0

This MR contains the following updates:

Package	Update	Change
quay.io/prometheuscommunity/postgres-exporter	minor	v0.14.0 -> v0.15.0

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infrastructure/postgres/release.yaml

@@ -43,7 +43,7 @@ data:
       sidecars:
         - name: "exporter"
           # renovate:
-          image: "quay.io/prometheuscommunity/postgres-exporter:v0.14.0"
+          image: "quay.io/prometheuscommunity/postgres-exporter:v0.15.0"
           ports:
             - name: exporter
               containerPort: 9187