Upgrade to Node.js 18 and bump all NPM dev dependencies

[eason9487]

Changes proposed in this Pull Request:

Closes #281

• Upgrade to use Node.js v18.
• Bump all dev dependencies to solve all vulnerabilities.
  • This reduces the number of npm vulnerabilities from 34 to 0. 🎉
• Fix JS linting errors.

Checks:

• Does your code follow the WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Detailed test instructions:

1. Set Node.js to v18.
2. Run npm install to see if it can finish without errors.
3. Run npm audit to check if it reports 0 vulnerabilities.
4. Check if npm start, npm run dev, npm run build, and npm run lint:js work well.
5. Go to the admin page of **WooCommerce > Settings > Integration > Google Analytics. Toggle the "Use Global Site Tag" checkbox to see if it can show/hide the "Set Domain Name" option.
6. Follow the same test steps in Fix the JS exceptions and incorrect quantity value for checkout event tracking #343 to determine if the event tracking is sent with *Checkout block.

Changelog entry

• Dev - Upgrade to Node.js 18.
• Dev - Upgrade all NPM dev dependencies.

[puntope]

Node v16 is still compatible and gives 0 issues as well.

[eason9487]

Please refer to #345 (comment).

[puntope]

Hi @eason9487

Thanks for the work done, however I see Node v16 is still compatible so I wonder if we should allow that version in the engines.

[eason9487]

Hi @puntope, thanks for the review.

however I see Node v16 is still compatible so I wonder if we should allow that version in the engines.

Node.js v16 has exceeded its end-of-life date, 11 Sep 2023, so there should be no need to keep v16.

[puntope]

✅ LGTM

Thanks @eason9487 for clarifying the npm v16 topic. This can be merged