Update NUnit.Console to 3.20.0

Author: renovate[bot]

Tools/packages.csproj

@@ -11,8 +11,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit.Console" Version="3.17.0" />
-    <PackageReference Include="NUnit.ConsoleRunner" Version="3.17.0" />
+    <PackageReference Include="NUnit.Console" Version="3.20.0" />
+    <PackageReference Include="NUnit.ConsoleRunner" Version="3.20.0" />
   </ItemGroup>
 
 </Project>