Updated to .NET 7.0 No more need to fix .NET to 5.x

Author: gsvgit

.github/workflows/build-on-pr.yml

@@ -38,8 +38,6 @@ jobs:
 
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v1
-        with:
-          dotnet-version: '5.0.x'
 
       - name: Build
         run: |