Update prepare-setup.md (#240)

Migrated tenancy from natdsecurity to c4u02 for this object hence the link has changed. Updating the link

Author: abhinavoracle

sample-livelabs-templates/sample-workshop-novnc/prepare-setup/prepare-setup.md

@@ -18,16 +18,16 @@ This lab assumes you have:
 
     <!-- *Note 1:* If providing a single Stack download for the workshop, use this simple expression. -->
 
-    - [sample-mkplc-freetier.zip](https://objectstorage.us-ashburn-1.oraclecloud.com/p/clKCvIhItftqqFoXdipFq5oukh0jVuwcKEMHVdqOPXN7oUqaoGwPZsimi5pgpfpR/n/natdsecurity/b/stack/o/sample-mkplc-freetier.zip)
+    - [sample-mkplc-freetier.zip](https://objectstorage.us-ashburn-1.oraclecloud.com/p/juVJbC9MgDKF1QzyJkgEHzqeCN1bLi7XGyHAZMXnw6Ci-8yJj-UKNC9SPJRIR7Ib/n/c4u02/b/hosted_workshops/o/stacks/ll-orm-mkplc-tenancy.zip)
 
     <!-- *Note 2:* If providing multiple Stacks download for the same workshop, use a conditional expression similar to the below. Keep in mind that the condition or *type* must be paired with a valid entry in the *manifest.json* file. Refer to *freetier-advanced* and *freetier-basics* -->
 
 <!-- 
 <if type="advanced">
-    - [sample-mkplc-advanced.zip](https://objectstorage.us-ashburn-1.oraclecloud.com/p/_EIwsXv5v6KkKcQldUQixExqAgJCbY826XovJec4I25rc4dHEZW4whrF-nb2QUye/n/natdsecurity/b/stack/o/sample-mkplc-advanced.zip)
+    - [sample-mkplc-advanced.zip](https://objectstorage.us-ashburn-1.oraclecloud.com/p/2-pWdKTRReH7z_v8n854ZpYazHK1kD-eZni2GFC7dJREQauomX-wJ6RPKHMaeZZB/n/c4u02/b/hosted_workshops/o/stacks/ll-orm-mkplc-tenancy-advanced.zip)
 </if>
 <if type="basics">
-    - [sample-mkplc-basics.zip](https://objectstorage.us-ashburn-1.oraclecloud.com/p/m4wcgeN1hw9D1zV3pgOkbRjwanAt5dIW7QsZS7znZNnHU63vh495UHhkiRtaDJHE/n/natdsecurity/b/stack/o/sample-mkplc-basics.zip)
+    - [sample-mkplc-basics.zip](https://objectstorage.us-ashburn-1.oraclecloud.com/p/eJzg9ZI4hnSXldacpoX6PaGaPbvcufnYqmpIVWV1j10ZjPObIKUeSwNa89H5XZjV/n/c4u02/b/hosted_workshops/o/stacks/ll-orm-mkplc-tenancy-basics.zip)
 </if>
  -->