feat: drop support for node v14 and test against node v20

[bradzacher]

Overview

As of April 30 2023 node14 is now out-of-support.
This PR drops it from our testing pipeline and bumps the engines config.
This PR also bumps the highest tested version to v20.

[typescript-eslint]

Thanks for the PR, @bradzacher!

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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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✅ Successfully ran 32 targets

• Node 20 - nx test eslint-plugin
• Node 16 - nx test eslint-plugin --coverage=false
• nx run-many --target=lint --parallel
• nx run-many --target=build --projects=website-eslint,website
• Node 20 - nx test typescript-estree
• Node 20 - nx test scope-manager
• Node 20 - nx test utils
• Node 20 - nx test type-utils
• Node 20 - nx run types:build
• Node 20 - nx test visitor-keys
• Node 20 - nx test repo-tools
• Node 20 - nx test parser
• Node 20 - nx test rule-schema-to-typescript-types
• Node 16 - nx test scope-manager --coverage=false
• nx run-many --target=typecheck --parallel
• Node 16 - nx test typescript-estree --coverage=false
• Node 16 - nx test eslint-plugin-internal --coverage=false
• nx run integration-tests:test
• Node 16 - nx run types:build
• Node 20 - nx test eslint-plugin-tslint
• Node 16 - nx test type-utils --coverage=false
• Node 20 - nx test ast-spec
• Node 16 - nx test parser --coverage=false
• Node 16 - nx test ast-spec --coverage=false
• Node 20 - nx test eslint-plugin-internal
• nx run types:build
• Node 16 - nx test rule-schema-to-typescript-types --coverage=false
• Node 16 - nx test eslint-plugin-tslint --coverage=false
• Node 16 - nx test visitor-keys --coverage=false
• Node 16 - nx test utils --coverage=false
• Node 16 - nx test repo-tools --coverage=false
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint

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[JoshuaKGoldberg]

🚀

[JoshuaKGoldberg]

FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory

Fun! 🙃