Update test/cluster/fixtures/worker.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: jkyberneees

test/cluster/fixtures/worker.ts

@@ -2,5 +2,6 @@
 // Exits on SIGTERM, otherwise stays alive indefinitely
 process.on('SIGTERM', () => process.exit(0))
 
-// Keep alive
-setInterval(() => {}, 1 << 30)
+// Keep alive for a very long time (about 1 billion ms ~ 11.5 days)
+const KEEP_ALIVE_INTERVAL = 1 << 30;
+setInterval(() => {}, KEEP_ALIVE_INTERVAL)