chore: update node version

[nikkaroraa]

Task:

Update node version to v18

Description

Fixes ENG-1959

Type of change

• [ ] New feature
• [ ] Bug fix
• [ ] Testing code
• [ ] Document update or config files
• [x] Deployment config

[linear[bot]]

ENG-1959 update node version for opyn site

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
continuouscall	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 13, 2024 8:57am