Updating Changelog

Added Version number bump to changelog

Author: lizharems

CHANGELOG.md

@@ -4,7 +4,7 @@
 - Debug from .csproj and .sln [#5876](https://github.com/dotnet/vscode-csharp/issues/5876)
 
 # Latest
-* Bump xamltools to 17.11.35027.17 (PR: [#7288](https://github.com/dotnet/vscode-csharp/pull/7288))
+* Bump xamltools to 17.12.35103.251 (PR: [#7309](https://github.com/dotnet/vscode-csharp/pull/7309))
   * Fix impossible to enter multiple spaces in attribute area
   * Fix cannot accept Copilot suggestion with Tab when IntelliSense is open
 * Fixing snippets in Razor LSP completion (PR: [#7274](https://github.com/dotnet/vscode-csharp/pull/7274))