Update Reject Hosts (`datadoghq.com`)

Source/domainset/reject_sukka.conf

@@ -966,6 +966,8 @@ analytics.bytegiftia.top
 .1897pentagram.com
 .webspecmail.com
 .cp-sap.sfmc-content.com
+.agent.datadoghq.com
+.agent.ap1.datadoghq.com
 
 # >> Alexa
 data.alexa.com