Update prepare-setup.md (#244)

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

enterprise-manager/odb-21c/dba-essentials/manage-instance-memory/prepare-setup/prepare-setup.md

@@ -14,7 +14,7 @@ This lab assumes you have -
 - An Oracle Free Tier or Paid Cloud account
 
 ## Task 1: Download Oracle Resource Manager (ORM) stack zip file
-1.  Click on the link below to download the Resource Manager zip file you need to build your environment: [emcc-dbae-2-mkplc-freetier.zip](https://objectstorage.us-ashburn-1.oraclecloud.com/p/45QlbADtilX7TE3zpYeOrVyF5StsG3AOfdFU4BAiwWesx-spDYOrIbF3xqDS2lDV/n/natdsecurity/b/stack/o/emcc-dbae-2-mkplc-freetier.zip)
+1.  Click on the link below to download the Resource Manager zip file you need to build your environment: [emcc-dbae-2-mkplc-freetier.zip](https://objectstorage.us-ashburn-1.oraclecloud.com/p/rq7lPAU-avye1ysIcJmFQhT37uvTg_QBcRLXKueBsnqNeA7GwFcmcfXv_YNODV2s/n/c4u02/b/hosted_workshops/o/stacks/emcc-dbae-2-mkplc-freetier.zip)
 
 2.  Save in your downloads folder.