fix: followup to prevent unhandled rejection

Author: szmarczak

src/proxy-server.ts

@@ -7,6 +7,8 @@ const server = new ProxyChainServer({
 server.server.unref();
 
 const listenPromise = server.listen();
+// eslint-disable-next-line @typescript-eslint/no-empty-function
+listenPromise.catch(() => {});
 
 // eslint-disable-next-line max-len
 // https://github.com/microsoft/playwright/blob/2e4722d460b5142267e0e506ca7ea9a259556b5f/packages/playwright-core/src/server/browserContext.ts#L423-L427