Bump C#: 9.0->11.0

AndreyAkinshin · AndreyAkinshin · commit 5065bc96e26f · 2023-07-04T17:37:11.000+02:00
diff --git a/build/common.props b/build/common.props
@@ -33,7 +33,7 @@
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(IsVisualBasic)' != 'true' AND '$(IsFsharp)' != 'true' ">
-    <LangVersion>9.0</LangVersion>
+    <LangVersion>11.0</LangVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition=" '$(VersionPrefix)' == '' ">
