removed .net5 as build target

Author: dragon7307

tests/unit-tests/UnitTests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net8.0;net7.0;net6.0;net5.0</TargetFrameworks>
+    <TargetFrameworks>net8.0;net7.0;net6.0</TargetFrameworks>
     <LangVersion>latest</LangVersion>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>