Bump test chart dependencies (#633)

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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": "75.10.0"
+    "version": "75.12.0"
   },
   {
     "name": "cert-manager",

.github/tests/oci-charts.json

@@ -2,7 +2,7 @@
   {
     "name": "mysql",
     "registry": "docker.io/bitnamicharts/mysql",
-    "version": "13.0.3"
+    "version": "13.0.4"
   },
   {
     "name": "postgresql",