fix(rollbar): ensure token is hidden

Signed-off-by: Andrew Thauer <athauer@wealthsimple.com>

.changeset/four-jars-protect.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-rollbar-backend': patch
+---
+
+ensure rollbar token is hidden

plugins/rollbar-backend/config.d.ts

@@ -20,6 +20,7 @@ export interface Config {
     /**
      * The authentication token for accessing the Rollbar API
      * @see https://explorer.docs.rollbar.com/#section/Authentication
+     * @visibility secret
      */
     accountToken: string;
   };