Set LangVersion compiler option to 11.0 (PowerShell#18877)

Author: xtqqczze

test/perf/dotnet-tools/ResultsComparer/ResultsComparer.csproj

@@ -3,7 +3,7 @@
     <OutputType>Exe</OutputType>
     <TargetFrameworks>$(PERFLAB_TARGET_FRAMEWORKS)</TargetFrameworks>
     <TargetFramework Condition="'$(TargetFrameworks)' == ''">net5.0</TargetFramework>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>11.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="CommandLineParser" Version="2.9.1" />

tools/packaging/projects/reference/Microsoft.PowerShell.Commands.Utility/Microsoft.PowerShell.Commands.Utility.csproj

@@ -5,7 +5,7 @@
     <DelaySign>true</DelaySign>
     <AssemblyOriginatorKeyFile>$(SnkFile)</AssemblyOriginatorKeyFile>
     <SignAssembly>true</SignAssembly>
-    <LangVersion>Latest</LangVersion>
+    <LangVersion>11.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System.Management.Automation">

tools/packaging/projects/reference/Microsoft.PowerShell.ConsoleHost/Microsoft.PowerShell.ConsoleHost.csproj

@@ -5,7 +5,7 @@
     <DelaySign>true</DelaySign>
     <AssemblyOriginatorKeyFile>$(SnkFile)</AssemblyOriginatorKeyFile>
     <SignAssembly>true</SignAssembly>
-    <LangVersion>Latest</LangVersion>
+    <LangVersion>11.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System.Management.Automation">

tools/packaging/projects/reference/System.Management.Automation/System.Management.Automation.csproj

@@ -5,7 +5,7 @@
     <DelaySign>true</DelaySign>
     <AssemblyOriginatorKeyFile>$(SnkFile)</AssemblyOriginatorKeyFile>
     <SignAssembly>true</SignAssembly>
-    <LangVersion>Latest</LangVersion>
+    <LangVersion>11.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.Management.Infrastructure" Version="2.0.0" />