Merge pull request github#18764 from michaelnebel/csharp/updatedocumentation

C#: Update the documentation on supported C# language versions and fr…

Author: michaelnebel

csharp/ql/lib/change-notes/2025-02-13-csharp13-dotnet9.md

@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* Full support for C# 13 / .NET 9. All new language features are now supported by the extractor. QL library and data flow support for the new C# 13 language constructs and generated MaD models for the .NET 9 runtime.

docs/codeql/reusables/supported-versions-compilers.rst

@@ -11,11 +11,11 @@
    Microsoft extensions (up to VS 2022),
 
    Arm Compiler 5 [4]_","``.cpp``, ``.c++``, ``.cxx``, ``.hpp``, ``.hh``, ``.h++``, ``.hxx``, ``.c``, ``.cc``, ``.h``"
-   C#,C# up to 12,"Microsoft Visual Studio up to 2019 with .NET up to 4.8,
+   C#,C# up to 13,"Microsoft Visual Studio up to 2019 with .NET up to 4.8,
 
    .NET Core up to 3.1
 
-   .NET 5, .NET 6, .NET 7, .NET 8","``.sln``, ``.csproj``, ``.cs``, ``.cshtml``, ``.xaml``"
+   .NET 5, .NET 6, .NET 7, .NET 8, .NET 9","``.sln``, ``.csproj``, ``.cs``, ``.cshtml``, ``.xaml``"
    Go (aka Golang), "Go up to 1.23", "Go 1.11 or more recent", ``.go``
    Java,"Java 7 to 22 [5]_","javac (OpenJDK and Oracle JDK),