Updated setup-nuget action

Author: hagronnestad

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Setup NuGet
-      uses: NuGet/setup-nuget@v1.0.5
+      uses: NuGet/setup-nuget@v2
 
     - name: Restore dependencies
       run: nuget restore $SOLUTION