Bump C# lang version

drewnoakes · drewnoakes · commit 7fc322accfaf · 2025-06-15T01:14:50.000+10:00
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
@@ -1,7 +1,7 @@
 <Project>
 
   <PropertyGroup>
-    <LangVersion>10</LangVersion>
+    <LangVersion>13</LangVersion>
     <Nullable>enable</Nullable>
     <ProduceReferenceAssembly>true</ProduceReferenceAssembly>
     <AccelerateBuildsInVisualStudio>true</AccelerateBuildsInVisualStudio>
