fix(docker): unset optional python version

Signed-off-by: AtomicFS <[email protected]>

Author: AtomicFS

.github/workflows/docker-build-and-test.yml

@@ -394,8 +394,6 @@ jobs:
     steps:
       - name: Setup python
         uses: actions/setup-python@v6
-        with:
-          python-version: '3.x'
 
       - name: Checkout
         uses: actions/checkout@v5