Bump node-addon-api

Bumps [node-addon-api](https://github.com/nodejs/node-addon-api) from 4.3.0 to 8.1.0.
- [Release notes](https://github.com/nodejs/node-addon-api/releases)
- [Changelog](https://github.com/nodejs/node-addon-api/blob/main/CHANGELOG.md)
- [Commits](nodejs/node-addon-api@v4.3.0...node-addon-api-v8.1.0)

---
updated-dependencies:
- dependency-name: node-addon-api
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

src/6-threadsafe-function/promise-callback-demo/node-addon-api/package.json

@@ -3,7 +3,7 @@
   "main": "test/index.js",
   "private": true,
   "dependencies": {
-    "node-addon-api": "^4.0.0"
+    "node-addon-api": "^8.1.0"
   },
   "scripts": {
     "install": "node-gyp rebuild && node test"