bug#65113: Emacs-29 and master csharp-mode with broken treesit

[J M <jean@tbm.email>]

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Hi all

Treesit is broken for csharp-mode in the latest version in master and emacs-29 and therefore does not provide syntax highlighting. 

The latest grammar repository (https://github.com/tree-sitter/tree-sitter-c-sharp) has removed the keyword void_keyword.

Please see attached the patch to resolve the issue.

Thanks
Jean M

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diff --git a/lisp/progmodes/csharp-mode.el b/lisp/progmodes/csharp-mode.el
index 00587a8a515..1a753cb309b 100644
--- a/lisp/progmodes/csharp-mode.el
+++ b/lisp/progmodes/csharp-mode.el
@@ -844,7 +844,7 @@ csharp-ts-mode--font-lock-settings
 
      (constructor_declaration name: (_) @font-lock-type-face)
 
-     (method_declaration type: [(identifier) (void_keyword)] @font-lock-type-face)
+     (method_declaration type: [(identifier) (predefined_type)] @font-lock-type-face)
      (method_declaration type: (generic_name (identifier) @font-lock-type-face))
      (method_declaration name: (_) @font-lock-function-name-face)
 

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