Add Wrangler Node version changelog entry

Author: jamesopstad

src/content/changelog/workers/2025-05-29-wrangler-node-version.mdx

@@ -0,0 +1,11 @@
+---
+title: Node.js v18 no longer supported by Wrangler v4
+description: Node.js v18 has reached end-of-life and is no longer supported in Wrangler v4
+products:
+  - workers
+date: 2025-05-30T00:00:00Z
+---
+
+Effective from version 4.18.0, Wrangler no longer supports Node.js v18.
+This is in line with our policy of supporting the [Current, Active, and Maintenance](https://nodejs.org/en/about/previous-releases) versions of Node.js.
+Node.js v18 reached [end-of-life](https://github.com/nodejs/release?tab=readme-ov-file#end-of-life-releases) on 2025-04-30.