Update prepare-setup.md (#245)

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

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

@@ -20,7 +20,7 @@ This lab assumes you have -
 
 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)
+	 - [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)
 
 1.  Save in your downloads folder.