CI/CD: Set up Python version

Author: zyzniewski

.github/workflows/e2e-subtensor-tests.yaml

@@ -80,6 +80,11 @@ jobs:
       - name: Check-out repository
         uses: actions/checkout@v4
 
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
       - name: Install uv
         uses: astral-sh/setup-uv@v4