test: declare timer used by progress race regression

test/download-progress-fences.test.js

@@ -1,4 +1,5 @@
 const { expect } = require("chai");
+const { setImmediate } = require("timers");
 require("ts-node/register/transpile-only");
 const db = require("../src/server/database");
 const Model = require("../src/core/model/anonymizedRepositories/anonymizedRepositories.model").default;