Refactor GitHub Actions workflow to simplify coverage testing and upload steps for Python 3.12

Author: rogeriojorge

.github/workflows/build_test.yml

@@ -42,20 +42,10 @@ jobs:
 
     - name: Run tests with coverage
       if: matrix.python-version == '3.12'
-      run: |
-        pip install coverage
-        coverage run --source=essos -m pytest .
-        coverage report
-        coverage xml
+      run: pytest --cov essos
 
     - name: Upload coverage reports to Codecov
       if: github.repository_owner == 'uwplasma' && matrix.python-version == '3.12'
       uses: codecov/codecov-action@v5
       with:
-        token: ${{ secrets.CODECOV_TOKEN }}
-        files: ./coverage.xml
-        flags: unittests
-        env_vars: PYTHON
-        name: codecov-umbrella
-        fail_ci_if_error: true
-        verbose: true
+        token: ${{ secrets.CODECOV_TOKEN }}