Removing os matrix

Author: rodneyosodo

.github/workflows/python-testing.yml

@@ -23,7 +23,6 @@ jobs:
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
-        os: ${{ matrix.os }}
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |