downgraded to 4.9.2 (#374)

Author: jchannon

src/Carter.Analyzers/Carter.Analyzers.csproj

@@ -27,7 +27,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.9.2" />
         <PackageReference Include="MinVer" Version="6.0.0">
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>