Change env variable that is referenced in the JH patch

Author: maulikjs

jupyterhub/jupyterhub/overrides/overlays/jupyterhub-deployment-patch/jupyterhub-patch.yaml

@@ -1,3 +1,3 @@
 - op: replace
-  path: /spec/template/spec/containers/0/env/4/valueFrom/secretKeyRef/name
+  path: /spec/template/spec/containers/0/env/3/valueFrom/secretKeyRef/name
   value: jupyterhub-prometheus-token-secrets