chore: remove deprecated settings

otterdog/eclipse-oomph.jsonnet

@@ -3,7 +3,6 @@ local orgs = import 'vendor/otterdog-defaults/otterdog-defaults.libsonnet';
 orgs.newOrg('eclipse-oomph') {
   settings+: {
     blog: "https://eclipse.dev/oomph",
-    dependabot_security_updates_enabled_for_new_repositories: false,
     description: "Provides tools and frameworks for working more effectively with the Eclipse IDE.",
     discussion_source_repository: "eclipse-oomph/oomph",
     email: "[email protected]",