Require node v20 everywhere

[cte]

Description

Let's do a bit better job of requiring a specific node version. Continue.dev using Node 20, and some of our npm packages are warning that are potentially not compatible with Node 18.

Type of change

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

How Has This Been Tested?

Checklist:

• My code follows the patterns of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Additional context

Related Issues

Reviewers

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Important

Update Node.js version to v20.18.1 across workflows, .nvmrc, flake.nix, and package.json for consistency and compatibility.

• Node.js Version Update:
  • Set NODE_VERSION to 20.18.1 in .github/workflows/changeset-release.yml, code-qa.yml, and marketplace-publish.yml.
  • Update .nvmrc to v20.18.1.
  • Change nodejs_18 to nodejs_20 and corepack_18 to corepack_20 in flake.nix.
  • Update package.json to require Node.js >=20.18.1 in engines field.
• Workflows:
  • Modify node-version to use NODE_VERSION environment variable in setup-node steps in workflows.
  • Ensure all jobs in workflows use Node.js v20.18.1 for consistency.

^{This description was created by for 1ac3770. It will automatically update as commits are pushed.}

[changeset-bot]

⚠️ No Changeset found

Latest commit: 1ac3770

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[ellipsis-dev]

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