Add .NET 4.6.2 target (#195)

* Add .NET 4.6.2 target

NUnit 4 does not support .NET Standard 2.0 anymore,
so we need to stay on NUnit 3 when targeting .NET Standard.

This commit adds a dedicated .NET 4.6.2 target that uses NUnit 4.

* Update Dependencies.props

---------

Co-authored-by: Florian Rohrer <dev@florianrohrer.ch>

src/Dependencies.props

@@ -1,5 +1,5 @@
 <Project>
   <PropertyGroup Label="Framework Versions">
-    <ResourceProjectTargetFrameworks>netstandard2.0;net6.0;net7.0;net8.0</ResourceProjectTargetFrameworks>
+    <ResourceProjectTargetFrameworks>netstandard2.0;net462;net6.0;net7.0;net8.0</ResourceProjectTargetFrameworks>
   </PropertyGroup>
 </Project>