Revert "Bump NUnit from 3.14.0 to 4.0.1"

This reverts commit c588527.

Author: JohanLarsson

Gu.Analyzers.Benchmarks/Gu.Analyzers.Benchmarks.csproj

@@ -27,7 +27,7 @@
     <PackageReference Include="Gu.Roslyn.Asserts" Version="4.3.0" />
     <PackageReference Include="IDisposableAnalyzers" Version="4.0.7" PrivateAssets="all" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.5.0" />
-    <PackageReference Include="NUnit" Version="4.0.1" />
+    <PackageReference Include="NUnit" Version="3.14.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" PrivateAssets="all" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556" PrivateAssets="all" />
   </ItemGroup>

Gu.Analyzers.Test/Gu.Analyzers.Test.csproj

@@ -29,7 +29,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="Moq" Version="4.20.70" />
     <PackageReference Include="Ninject" Version="3.3.6" />
-    <PackageReference Include="NUnit" Version="4.0.1" />
+    <PackageReference Include="NUnit" Version="3.14.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" PrivateAssets="all" />
     <PackageReference Include="ReflectionAnalyzers" Version="0.3.1" PrivateAssets="all" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.2.0-beta.556" PrivateAssets="all" />

ValidCode/ValidCode.csproj

@@ -12,7 +12,7 @@
   <ItemGroup>
     <PackageReference Include="Moq" Version="4.20.70" />
     <PackageReference Include="Ninject" Version="3.3.6" />
-    <PackageReference Include="NUnit" Version="4.0.1" />
+    <PackageReference Include="NUnit" Version="3.14.0" />
     <PackageReference Include="System.Reactive.PlatformServices" Version="6.0.0" />
   </ItemGroup>