chore: bump engines to node 18

[bjoerge]

Description

This should make it more clear that we don't provide official support for node < 18. It doesn't necessarily mean that stuff will break using e.g. node 16, and can be bypassed with yarn install --ignore-engines or npm install --ignore-engines

Notes for release

• Bump engines.node to >= 18

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
performance-studio	✅ Ready (Inspect)	Visit Preview		Oct 9, 2023 8:42am
test-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 9, 2023 8:42am

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
studio-workshop	⬜️ Ignored (Inspect)			Oct 9, 2023 8:42am

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Oct 9, 2023 8:44 AM (UTC)

File	Status	Duration	Passed	Skipped	Failed
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	11s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	9s	3	0	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	10s	6	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	13s	9	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	46s	18	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	10s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	5s	3	0	0