fix: TargetFramework, removed net7.0 and added net9.0

Author: samtrion

tests/NetEvolve.Arguments.Tests.Unit/NetEvolve.Arguments.Tests.Unit.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net8.0;net9.0</TargetFrameworks>
     <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
 
     <NoWarn>$(NoWarn);NU1701</NoWarn>