Bump test chart dependencies (#647)

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: marcofranssen <[email protected]>

.github/tests/charts.json

@@ -2,7 +2,7 @@
   {
     "name": "kube-prometheus-stack",
     "repo": "https://prometheus-community.github.io/helm-charts",
-    "version": "75.15.1"
+    "version": "76.4.0"
   },
   {
     "name": "cert-manager",
@@ -12,6 +12,6 @@
   {
     "name": "ingress-nginx",
     "repo": "https://kubernetes.github.io/ingress-nginx",
-    "version": "4.13.0"
+    "version": "4.13.1"
   }
 ]