Switch CI to run .NET 7 tests

Author: Sergio0694

azure-pipelines.yml

@@ -53,14 +53,14 @@ jobs:
 
   # Test solution #
 
+  # Run .NET 7 unit tests
+  - script: dotnet test --no-build -c $(Build.Configuration) -f net7.0 -l "trx;LogFileName=VSTestResults_net7.0.trx"
+    displayName: Run .NET 7 unit tests
+
   # Run .NET 6 unit tests
   - script: dotnet test --no-build -c $(Build.Configuration) -f net6.0 -l "trx;LogFileName=VSTestResults_net6.0.trx"
     displayName: Run .NET 6 unit tests
 
-  # Run .NET Core 3.1 unit tests
-  - script: dotnet test --no-build -c $(Build.Configuration) -f netcoreapp3.1 -l "trx;LogFileName=VSTestResults_netcoreapp3.1.trx"
-    displayName: Run .NET Core 3.1 unit tests
-
   # Run .NET Framework 4.7.2 unit tests
   - script: dotnet test --no-build -c $(Build.Configuration) -f net472 -l "trx;LogFileName=VSTestResults_net472.trx"
     displayName: Run .NET Framework 4.7.2 unit tests