Update historymapping.yml (#1149)

Author: bmorelli25

src/docs-assembler/historymapping.yml

@@ -25,7 +25,7 @@ mappings:
   en/beats/packetbeat: stack
   en/beats/topbeat: stack
   en/beats/winlogbeat: stack
-  en/cloud-enterprise: 3.7
+  en/cloud-enterprise: 3.8
   en/cloud-heroku: undefined
   en/cloud-on-k8s: 2.16
   en/cloud: undefined