Bump nuget/setup-nuget from 1 to 2

Bumps [nuget/setup-nuget](https://github.com/nuget/setup-nuget) from 1 to 2.
- [Release notes](https://github.com/nuget/setup-nuget/releases)
- [Commits](NuGet/setup-nuget@v1...v2)

---
updated-dependencies:
- dependency-name: nuget/setup-nuget
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/CI_build.yml

@@ -25,7 +25,7 @@ jobs:
       uses: microsoft/setup-msbuild@v1
 
     - name: Setup NuGet
-      uses: nuget/setup-nuget@v1
+      uses: nuget/setup-nuget@v2
 
     - name: Nuget restore
       working-directory: PlantUmlViewer/