Bump test chart dependencies (#379)

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

.github/tests/charts.json

@@ -2,12 +2,12 @@
   {
     "name": "kube-prometheus-stack",
     "repo": "https://prometheus-community.github.io/helm-charts",
-    "version": "59.1.0"
+    "version": "60.0.2"
   },
   {
     "name": "cert-manager",
     "repo": "https://charts.jetstack.io",
-    "version": "v1.14.5"
+    "version": "v1.15.0"
   },
   {
     "name": "ingress-nginx",
@@ -17,11 +17,11 @@
   {
     "name": "mysql",
     "repo": "https://charts.bitnami.com/bitnami",
-    "version": "11.1.0"
+    "version": "11.1.2"
   },
   {
     "name": "postgresql",
     "repo": "https://charts.bitnami.com/bitnami",
-    "version": "15.5.1"
+    "version": "15.5.4"
   }
 ]