docs: remove Astro link in v3.9 blog post (nodejs upgrade) (facebook#11469)

Author: slorber

website/blog/releases/3.9/index.mdx

@@ -24,7 +24,7 @@ import BrowserWindow from '@site/src/components/BrowserWindow';
 
 In [#11408](https://github.com/facebook/docusaurus/pull/11408), we have dropped support for Node.js 18, and the new minimum required Node.js version is now v20.0.
 
-Although it may look like a runtime requirement breaking change, Node.js 18 reached [End-of-Life](https://nodejs.org/en/about/releases/). It [won't receive security updates](https://nodejs.org/en/blog/announcements/node-18-eol-support), and you shouldn't use it anymore. Dropping End-of-Life versions of Node.js on minor version releases is a common practice in the Node.js ecosystem (see for examples [Astro 5.8](https://astro.build/blog/astro-580/)), that we now officially endorse and document on our [release process](/community/release-process#nodejs-support).
+Although it may look like a runtime requirement breaking change, Node.js 18 reached [End-of-Life](https://nodejs.org/en/about/releases/). It [won't receive security updates](https://nodejs.org/en/blog/announcements/node-18-eol-support), and you shouldn't use it anymore. Dropping End-of-Life versions of Node.js on minor version releases is a common practice in the Node.js ecosystem, that we now officially endorse and document on our [release process](/community/release-process#nodejs-support).
 
 This upgrade is further motivated by our dependencies: