Update netlicensing-csharp-dependency.yml

Author: r-brown

.github/workflows/netlicensing-csharp-dependency.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: '3.1.x'
+        dotnet-version: '3.1.402'
     - name: Init application / add dependency / run
       run: |
         dotnet new console -o netlicensing-dependency-test