Updated update-check service URL to check.ghost.org

[rob-ghost]

Problem

Ghost's update-check service runs on updates.ghost.org (a DigitalOcean droplet). It is being replaced by a Cloudflare Worker at check.ghost.org.

Solution

Point the default updateCheck.url at check.ghost.org. The new Worker is a backwards-compatible drop-in — identical request and response contract — so this is purely a default-endpoint change. updates.ghost.org stays up to drain existing installs, which keep their current config until they upgrade.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 944fcdc and 7521983.

📒 Files selected for processing (1)

• ghost/core/core/shared/config/defaults.json

✅ Files skipped from review due to trivial changes (1)

• ghost/core/core/shared/config/defaults.json

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Walkthrough

This PR updates the default update check service URL in Ghost's configuration file. The updateCheck.url setting in ghost/core/core/shared/config/defaults.json is changed from https://updates.ghost.org to https://check.ghost.org. This is a single-line configuration change that redirects the update checker to a new endpoint.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and accurately describes the main change: updating the update-check service URL configuration from updates.ghost.org to check.ghost.org.
Description check	✅ Passed	The description is directly related to the changeset, explaining the problem, solution, and reasoning behind the URL endpoint change with appropriate context about backwards compatibility.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/update-check-url-cf-worker

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