chore: drop node v18 support

[iiio2]

Actually I think nuxt has dropped support for node v18. But here in the package.json file, the engines node is still v18. That is why I've updated it to node v20.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@nuxt/image@2009

commit: c580582

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 7.07%. Comparing base (b7f4a95) to head (c580582).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2009   +/-   ##
=====================================
  Coverage   7.07%   7.07%           
=====================================
  Files         77      77           
  Lines       3590    3590           
  Branches     139     139           
=====================================
  Hits         254     254           
  Misses      3288    3288           
  Partials      48      48           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.