Adds news posts for 1 releases

* ion-dotnet v.1.3.4

Author: github-actions

_data/libraries.json

@@ -9,8 +9,8 @@
   {
     "name": "ion-dotnet",
     "category": "core",
-    "latest_release_version": "1.3.2",
-    "latest_release_date": "2025-06-18"
+    "latest_release_version": ".1.3.4",
+    "latest_release_date": "2025-06-20"
   },
   {
     "name": "ion-java",

_posts/2025-06-20-ion-dotnet-_1_3_4-released.md

@@ -0,0 +1,11 @@
+---
+layout: news_item
+title: "Ion Dotnet .1.3.4 Released"
+date: 2025-06-20
+categories: news ion-dotnet
+---
+
+Ion Dotnet .1.3.4 is now available.
+
+| [Release Notes v.1.3.4](https://github.com/amazon-ion/ion-dotnet/releases/tag/v.1.3.4) | [Ion Dotnet](https://github.com/amazon-ion/ion-dotnet) |
+