feat: Bump minimum node.js version and DOM Testing Library

[afontcu]

• Update DOM Testing Lib to https://github.com/testing-library/dom-testing-library/releases/tag/v9.0.0
• Update Minimum Node.js version.
• Cleanup examples.

[codecov[bot]]

Codecov Report

Merging #303 (7d64924) into main (6dd4847) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #303   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            3         3           
  Lines           78        78           
  Branches        27        27           
=========================================
  Hits            78        78           

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[github-actions[bot]]

:tada: This PR is included in version 7.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: