add 1.20.0 release into news

Signed-off-by: Ti-Tai Wang <titaiwang@microsoft.com>

Author: titaiwangms

js/news.json

@@ -1,5 +1,15 @@
 {
     "newsContent": [
+        {
+            "id": "87",
+            "newsId": "news87",
+            "newsTitle": "ONNX v1.20.0 Released",
+            "newsShortTitle": "ONNX v1.20.0 Released",
+            "newsDescription": "ONNX v1.20.0 is now available. This release includes numerous new features including support for additional data types, blocked quantization, a new TreeEnsemble operator, and Python 3.12 support just to name a few. To see the complete list, including additional bug and security fixes, see https://github.com/onnx/onnx/releases/tag/v1.20.0.",
+            "newsLinkText": "Release Notes on GitHub",
+            "newsLinkURL": "https://github.com/onnx/onnx/releases/tag/v1.20.0",
+            "newsDate": "December 1, 2025"
+        },
 	    {
             "id": "86",
             "newsId": "news86",