🔧 Update uv setup in GA workflow

Author: alejsdev

.github/workflows/test-backend.yml

@@ -21,9 +21,6 @@ jobs:
           python-version: "3.10"
       - name: Install uv
         uses: astral-sh/setup-uv@v7
-        with:
-          version: "0.4.15"
-          enable-cache: true
       - run: docker compose down -v --remove-orphans
       - run: docker compose up -d db mailcatcher
       - name: Migrate DB