Remove url in jenkins job configuration

Author: Conky5

.ci/jobs/defaults.yml

@@ -31,7 +31,6 @@
     triggers:
     - github
     vault:
-      url: https://secrets.elastic.co:8200
       # vault read auth/approle/role/clients-ci/role-id
       role_id: ddbd0d44-0e51-105b-177a-c8fdfd445126
     axes: