Update changelog to include clang-format for C#

Author: gs-101

CHANGELOG.md

@@ -26,6 +26,8 @@ The format is based on [Keep a Changelog].
   [zig](https://ziglang.org/) ([#327]).
 * `csharpier` for
   [C#](https://learn.microsoft.com/en-us/dotnet/csharp/) ([#328]).
+* `clang-format` for
+  [C#](https://learn.microsoft.com/en-us/dotnet/csharp/) ([#328]).
 
 ### Bugs fixed
 * `apheleia-npx` would use an incorrect path for the Yarn PnP ESM