Bump test chart dependencies (#382)

Bump the Helm charts used in test scenarios to latest available
versions.

Signed-off-by: GitHub <noreply@github.com>
Co-authored-by: marcofranssen <marcofranssen@users.noreply.github.com>
Co-authored-by: Faisal Memon <fymemon@yahoo.com>

.github/tests/charts.json

@@ -2,7 +2,7 @@
   {
     "name": "kube-prometheus-stack",
     "repo": "https://prometheus-community.github.io/helm-charts",
-    "version": "47.1.0"
+    "version": "47.4.0"
   },
   {
     "name": "cert-manager",
@@ -17,11 +17,11 @@
   {
     "name": "mysql",
     "repo": "https://charts.bitnami.com/bitnami",
-    "version": "9.10.4"
+    "version": "9.10.5"
   },
   {
     "name": "postgresql",
     "repo": "https://charts.bitnami.com/bitnami",
-    "version": "12.6.0"
+    "version": "12.6.4"
   }
 ]