[Snyk] Upgrade @astrojs/starlight from 0.12.1 to 0.15.0

[kimthuatcs]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to upgrade @astrojs/starlight from 0.12.1 to 0.15.0.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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- The recommended version is **4 versions** ahead of your current version. - The recommended version was released **a month ago**, on 2023-12-06. The recommended version fixes: Severity | Issue | PriorityScore (*) | Exploit Maturity | :-------------------------:|:-------------------------|-------------------------|:------------------------- | Regular Expression Denial of Service (ReDoS)
[SNYK-JS-ZOD-5925617](https://snyk.io/vuln/SNYK-JS-ZOD-5925617) | **482/1000**
**Why?** Proof of Concept exploit, CVSS 7.5 | Proof of Concept (*) Note that the real score may have changed since the PR was raised.

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