Bump nunit from 3.13.3 to 4.0.0

Bumps [nunit](https://github.com/nunit/nunit) from 3.13.3 to 4.0.0.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/master/CHANGES.md)
- [Commits](nunit/nunit@v3.13.3...v4.0.0)

---
updated-dependencies:
- dependency-name: nunit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

LogViewer.Server.Tests/LogViewer.Server.Tests.csproj

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="Moq" Version="4.20.69" />
-    <PackageReference Include="nunit" Version="3.13.3" />
+    <PackageReference Include="nunit" Version="4.0.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
   </ItemGroup>