fix: use setTimeout Promise (#58)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
	- Introduced a custom sleep function for handling delays.
- Added a new GitHub Actions workflow for continuous integration with
Node.js 14.

- **Bug Fixes**
- Maintained existing error handling for retry logic in the waitPort
function.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/nodejs-14.yml

@@ -0,0 +1,22 @@
+name: Node.js 14 CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: irby/setup-node-nvm@master
+        with:
+          node-version: '16.x'
+      - run: npm install
+      - run: npm run prepublishOnly
+      - run: node -v
+      - run: . /home/runner/mynvm/nvm.sh && nvm install 14 && nvm use 14 && node -v && node dist/commonjs/bin/detect-port.js

src/wait-port.ts

@@ -1,9 +1,14 @@
 import { debuglog } from 'node:util';
-import { setTimeout as sleep } from 'node:timers/promises';
 import detectPort from './detect-port.js';
 
 const debug = debuglog('detect-port:wait-port');
 
+function sleep(ms: number) {
+  return new Promise(resolve => {
+    setTimeout(resolve, ms);
+  });
+}
+
 export class WaitPortRetryError extends Error {
   retries: number;
   count: number;