Bump test chart dependencies (#779)

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": "82.13.2"
+    "version": "82.15.1"
   },
   {
     "name": "cert-manager",
     "repo": "https://charts.jetstack.io",
-    "version": "v1.20.0"
+    "version": "v1.20.1"
   },
   {
     "name": "ingress-nginx",

.github/tests/oci-charts.json

@@ -2,7 +2,7 @@
   {
     "name": "mariadb",
     "registry": "docker.io/bitnamicharts/mariadb",
-    "version": "25.0.5"
+    "version": "25.0.6"
   },
   {
     "name": "postgresql",