Update target framework

Author: abhinavminhas

QueryDB.Core.Tests/QueryDB.Core.Tests.csproj

@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-	  <!--<TargetFramework>netcoreapp3.1</TargetFramework>-->
-	  <TargetFrameworks>netcoreapp3.1;net5.0;net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
+	  <TargetFramework>netcoreapp3.1</TargetFramework>
+	  <!--<TargetFrameworks>netcoreapp3.1;net5.0;net6.0;net7.0;net8.0;net9.0</TargetFrameworks>-->
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>