Bump test chart dependencies

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.github/tests/charts.json

@@ -2,7 +2,7 @@
   {
     "name": "kube-prometheus-stack",
     "repo": "https://prometheus-community.github.io/helm-charts",
-    "version": "80.6.0"
+    "version": "80.8.0"
   },
   {
     "name": "cert-manager",

.github/tests/oci-charts.json

@@ -7,7 +7,7 @@
   {
     "name": "postgresql",
     "registry": "docker.io/bitnamicharts/postgresql",
-    "version": "18.1.9"
+    "version": "18.2.0"
   },
   {
     "name": "envoy-gateway",