Update to Node 20

[mvarrieur]

Node 16 is deprecated in Github Actions: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/

• Upgrade to Node 20
• Bump major version
• Update actions/checkout, actions/cache, actions/setup-node, actions/setup-dotnet to v4 which are all upgraded to Node 20, and actions/setup-go to v4 because it was available
• Update README with v4 action examples
• Upgrade npm packages that did not allow node 20 as an engine: shescape and eslint-plugin-jsdoc
• Remove eslint rule jsdoc/newline-after-description because it no longer exists, replaced by jsdoc/tag-lines, see: https://github.com/gajus/eslint-plugin-jsdoc/releases/tag/v42.0.0

[INRIX-Iurii-Okhmat]

https://github.com/wearerequired/lint-action/pull/768

[mvarrieur]

@INRIX-Iurii-Okhmat Thanks for linking, I even made a quick pass through the open PRs and missed that one, I'll close this!