Drop support for Node 20

[gonzaloriestra]

WHY are these changes introduced?

Node 20 has reached EOL

WHAT is this pull request doing?

• Drop support for Node 20
• Remove it from the workflows

How to test your changes?

CI

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

[gonzaloriestra]

• Use Node 26 by default #7517
• Drop support for Node 20 #7516 👈 (View in Graphite)
• main

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[github-actions]

⚠️ Potential Breaking Changes Detected

This PR contains changes that may break the existing contract.

@shopify/dev_experience — this PR contains breaking changes that require coordination for the next major release. This check will remain failed until a member of the team approves the workflow run.

💬 Head to #help-dev-platform to discuss timing and plan the release.

📦 Major Version Changesets

The following changesets request a major version bump:

Changeset	Package
thin-webs-notice.md	'@shopify/plugin-did-you-mean': major
thin-webs-notice.md	'@shopify/plugin-cloudflare': major
thin-webs-notice.md	'@shopify/create-app': major
thin-webs-notice.md	'@shopify/cli-kit': major
thin-webs-notice.md	'@shopify/store': major
thin-webs-notice.md	'@shopify/theme': major
thin-webs-notice.md	'@shopify/app': major
thin-webs-notice.md	'@shopify/cli': major
thin-webs-notice.md	'@shopify/e2e': major

[gonzaloriestra]

Merge activity

• May 11, 9:45 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• May 11, 9:46 AM UTC: @gonzaloriestra added this pull request to the GitHub merge queue with Graphite.
• May 11, 11:21 AM UTC: A user started a stack merge that includes this pull request via Graphite.