Update Python setup and remove coverage upload step

Removed coverage upload step and updated Python setup action.

Author: timkpaine

.github/workflows/build.yaml

@@ -51,13 +51,8 @@ jobs:
         restore-keys: cache-${{ runner.os }}-
       if: ${{ runner.os == 'Windows' }}
 
-<<<<<<< before updating
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
-=======
-    - name: Upload coverage
-      uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
->>>>>>> after updating
       with:
         python-version: ${{ matrix.python-version }}
         cache: 'pip'