fix: update C# language version to latest for switch expressions

Author: CalvinAllen

src/CodingWithCalvin.CouchbaseExplorer/CodingWithCalvin.CouchbaseExplorer.csproj

@@ -22,7 +22,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <DebugType>full</DebugType>
     <PlatformTarget>x64</PlatformTarget>
-    <LangVersion>7.3</LangVersion>
+    <LangVersion>latest</LangVersion>
     <ErrorReport>prompt</ErrorReport>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x64'">
@@ -31,7 +31,7 @@
     <Optimize>true</Optimize>
     <DebugType>pdbonly</DebugType>
     <PlatformTarget>x64</PlatformTarget>
-    <LangVersion>7.3</LangVersion>
+    <LangVersion>latest</LangVersion>
     <ErrorReport>prompt</ErrorReport>
   </PropertyGroup>
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />