Update Workers changelog with V8 14.0 (#24661)

* Update Workers changelog with V8 14.0

Weekly changelog update from the runtime.

* Add to v8 14 release notes.

* Update src/content/release-notes/workers.yaml

Co-authored-by: Jun Lee <[email protected]>

---------

Co-authored-by: mar-cf <[email protected]>
Co-authored-by: Jun Lee <[email protected]>

Author: 3 people

src/content/release-notes/workers.yaml

@@ -3,6 +3,10 @@ link: "/workers/platform/changelog/"
 productName: Workers
 productLink: "/workers/"
 entries:
+  - publish_date: "2025-08-21"
+    description: |-
+      - Updated v8 to version 14.0.
+      - `Uint8Array` type in JavaScript now supports base64 and hex operations.
   - publish_date: "2025-08-14"
     description: |-
       - Enable V8 Sandbox for improved isolation and security.