Fix GitHub Actions workflow - remove pip cache (no requirements file)

Author: CodeReclaimers

.github/workflows/tests.yml

@@ -32,7 +32,6 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
-        cache: 'pip'
 
     - name: Install dependencies
       run: |