Update dotnet.yml

Author: iscifoni

.github/workflows/dotnet.yml

@@ -33,10 +33,6 @@ jobs:
         uses: actions/setup-dotnet@v1
         with:
           dotnet-version: 3.1.100
-      - name: Setup .NET Core 2.2
-        uses: actions/setup-dotnet@v1
-        with:
-          dotnet-version: 2.2.402
       - name: Install GitVersion
         uses: gittools/actions/gitversion/setup@v0.9.7
         with: