chore(dummy_app): bin/importmap unpin @github/webauthn-json

Author: joaquintomas2003

test/dummy/config/importmap.rb

@@ -5,5 +5,4 @@
 pin "@hotwired/stimulus", to: "stimulus.min.js"
 pin "@hotwired/stimulus-loading", to: "stimulus-loading.js"
 pin_all_from "app/javascript/controllers", under: "controllers"
-pin "@github/webauthn-json", to: "https://ga.jspm.io/npm:@github/webauthn-json@2.1.1/dist/esm/webauthn-json.js"
 pin "webauthn-rails/credential", to: "credential.js"