chore(asdf2devbox): Remove credhub mapping

# Issue

`credhub` is not part of `.tool-versions`, so no mapping is needed

# Fix

Remove `credhub` mapping

Author: silvestre

scripts/asdf2devbox.py

@@ -24,7 +24,6 @@ def get_installed_version(package):
                 "bosh": "bosh-cli",
                 "cf": "cloudfoundry-cli",
                 "concourse": "fly",
-                "credhub": "credhub-cli",
                 "gcloud": "google-cloud-sdk",
                 "golang": "go",
                 "java": "temurin-bin-17",