feat: add support of Node ^20, ^22, ^23

[jirikapoun]

There are three unreleased commits in master, one of them already added support for Node 20, but using the version range <=20 which also allows for all older major versions, including those for which the support has already been dropped. Changed to ^20, following the previous convention.

CI target now runs tests also for the newly added versions (22, 23).

⚠️ Since the unreleased commit also drops support for Node versions 12, 14 and 16, the subsequent release should be a major version bump. But I guess this will be automatically handled by a CI job.

⚠️ One of these commits also migrates ESLint config to the new flat format, including the legacy override for the linebreak-style rule. Instead of fixing the ESLint execution for Windows platform, this override now breaks it – see CI logs. Moreover, the updated base config doesn't use this rule anymore, but @stylistic/linebreak-style which is an equivalent successor. Since it is now not being overriden, the two rules apply at the same time, so on Windows, each of them requires the opposite style and thus it's impossible to satisfy both of them at once. I solved the issue by removing the override completely, while enforcing LF endings on Windows using the .gitattributes file.

[github-actions]

🎉 This PR is included in version 3.0.0 🎉

The release is available on:

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

Your semantic-release bot 📦🚀