[chore] update Node.js engine version to 20.x

[FathyMuhamed]

Summary

update node engines to 20.x

• v18 support will end soon, so upgrading to v20 ensures you receive security updates for a longer period.
• Node.js v20 will have long-term support (LTS) until April 2026, making it a safer choice for long-term projects.

endoflife v18

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[vercel]

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