Update devtron-installer.yaml

Author: pawan-mehta-dt

manifests/install/devtron-installer.yaml

@@ -4,4 +4,4 @@ metadata:
   name: installer-devtron
   namespace: devtroncd
 spec:
-  url: https://raw.githubusercontent.com/devtron-labs/devtron/v1.2.1-rc.0/manifests/installation-script
+  url: https://raw.githubusercontent.com/devtron-labs/devtron/v1.2.1/manifests/installation-script