ci: debug (replace var with secret)

Author: triceo

.github/dependabot.yml

@@ -4,7 +4,7 @@ registries:
  enterprise:
  type: maven-repository
  url: https://timefold.jfrog.io/artifactory/releases/
- username: ${{ vars.JFROG_ENTERPRISE_READ_ONLY_ACCESS_USERNAME }}
+ username: ${{ secrets.JFROG_ENTERPRISE_READ_ONLY_REFERENCE_USERNAME }}
  password: ${{ secrets.JFROG_ENTERPRISE_READ_ONLY_REFERENCE_TOKEN }}
 
 multi-ecosystem-groups: