ci: remove setup-python pip cache to avoid dependency-file detection error in single-file project

Author: Arturo R Montesinos

.github/workflows/ci.yml

@@ -22,7 +22,6 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-          cache: "pip"
 
       - name: Install test deps
         run: |