feat(backend): Update minimum node version to 20

[jacekradko]

Description

Fixes: USER-3541

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: e1fd4c5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
@clerk/backend	Major
@clerk/agent-toolkit	Patch
@clerk/astro	Patch
@clerk/express	Patch
@clerk/fastify	Patch
@clerk/nextjs	Patch
@clerk/nuxt	Patch
@clerk/react-router	Patch
@clerk/remix	Patch
@clerk/tanstack-react-start	Patch
@clerk/testing	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

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Project	Deployment	Preview	Comments	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Comment	Oct 7, 2025 2:25am

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/backend-node-20

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commit: 09fa4d0

[Copilot]

Pull Request Overview

Updates the minimum Node.js version requirement from 18.17.0 to 20.0.0 for the backend package, marking this as a major breaking change.

• Bumps minimum Node.js version from 18.17.0 to 20.0.0 in package.json engines field
• Adds changeset documenting the breaking change with major version bump

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/backend/package.json	Updates Node.js engines requirement to >=20.0.0
.changeset/cuddly-shrimps-refuse.md	Documents the breaking change for version release

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