[workers] Update release notes with recent changes

- V8 update to 14.2
- JSON.parse() optimization
- Console warnings now also go to tail Workers

Author: harrishancock

src/content/release-notes/workers.yaml

@@ -3,6 +3,13 @@ link: "/workers/platform/changelog/"
 productName: Workers
 productLink: "/workers/"
 entries:
+  - publish_date: "2025-10-22"
+    description: |-
+      - Warnings which were previously only visible via the devtools console in preview sessions are now also sent to the tail Worker, if one is attached.
+  - publish_date: "2025-10-17"
+    description: |-
+      - Updated v8 to version 14.2.
+      - Backported an optimization to `JSON.parse()`. More details are [available in this blog post](https://blog.cloudflare.com/unpacking-cloudflare-workers-cpu-performance-benchmarks/#json-parsing) and [the upstream patch](https://chromium-review.googlesource.com/c/v8/v8/+/7027411).
   - publish_date: "2025-09-18"
     description: |-
       - Updated v8 to version 14.1.