Update CHANGELOG.md

Author: Stefani Moore

CHANGELOG.md

@@ -13,6 +13,7 @@
   * Update NOTICE.txt (#10768) (PR: [#10768](https://github.com/dotnet/razor/pull/10768))
   * Allow @@ as a fallback (#10752) (PR: [#10752](https://github.com/dotnet/razor/pull/10752))
   * Support component rename from an end tag (#10762) (PR: [#10762](https://github.com/dotnet/razor/pull/10762))
+* Bump xamltools to 17.12.35223.16 (PR: [#7464](https://github.com/dotnet/vscode-csharp/pull/7464))
 
 # 2.45.17
 * Fix check for rzls being present (PR: [#7462](https://github.com/dotnet/vscode-csharp/pull/7462))