Update dependency NUnit to v4

Author: renovate[bot]

tests/data/nunit/src/calc.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit" Version="3.13.2" />
+    <PackageReference Include="NUnit" Version="4.3.1" />
     <PackageReference Include="NUnit.ConsoleRunner" Version="3.12.0" />
     <PackageReference Include="NUnit.Extension.NUnitV2ResultWriter" Version="3.6.0" />
   </ItemGroup>