test(unit): targeting .NET 9 to support modern testing features

Author: engineering87

SharpHelpers/SharpHelpers.UnitTest/SharpHelpers.UnitTest.csproj

@@ -1,15 +1,15 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="3.8.3" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.8.3" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.9.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.9.3" />
   </ItemGroup>
 
   <ItemGroup>

SharpHelpers/SharpHelpers.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.28307.645
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.36105.23 d17.13
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SharpHelpers", "SharpHelpers\SharpHelpers.csproj", "{0B9C8349-C268-46BE-85C7-CBBF125C120B}"
 EndProject

SharpHelpers/SharpHelpers/SharpHelpers.csproj

@@ -45,6 +45,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Text.Json" Version="9.0.4" />
+    <PackageReference Include="System.Text.Json" Version="9.0.7" />
   </ItemGroup>
 </Project>