test: update nunit to v4

Author: viceice

project/Tests/Snapper.Nunit.Tests/Snapper.Nunit.Tests.csproj

@@ -8,8 +8,8 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.1" />
-    <PackageReference Include="NUnit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+    <PackageReference Include="NUnit" Version="4.0.1" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
   </ItemGroup>
 
   <ItemGroup>

project/Tests/Snapper.TestFrameworkSupport.Tests/Snapper.TestFrameworkSupport.Tests.csproj

@@ -14,8 +14,8 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="NUnit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+    <PackageReference Include="NUnit" Version="4.0.1" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.1" />
   </ItemGroup>
   <ItemGroup>