Use setup action in validation workflow

.github/workflows/validate.yaml

@@ -10,16 +10,8 @@ jobs:
       - name: Check out repo
         uses: actions/checkout@v3
 
-      - name: Set up Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: "3.12"
-          cache: "pip"
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip uv
-          uv pip install --system -r requirements.txt
+      - name: Setup Python and install dependencies
+        uses: ./.github/actions/setup-test-environment
 
       - name: Validate YAML files
         run: felis validate --check-redundant-datatypes ./yml/*.yaml