chore: drop support for node v14.17, v17

[bmish]

BREAKING CHANGE:
Drops support for end-of-life node v14.17 and v17

Fixes #5917.

As per: #5917 (comment)

Using minimum Node 14.18 enables full support for node: protocol imports: https://2ality.com/2021/12/node-protocol-imports.html

Node 17 is end-of-life already.

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[typescript-eslint]

Thanks for the PR, @bmish!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[JoshuaKGoldberg]

💯, thanks!

Love to see those versions ticking up 😄