ci: update backend test workflow configuration

Author: titusz

.github/workflows/test-backend.yaml

@@ -18,19 +18,11 @@ jobs:
       - name: Install Poetry
         run: pipx install poetry==1.2.1
 
-      - name: Get python version
-        run: |
-          python_version=$(grep -oP 'python \K(.*)' .tool-versions)
-          echo "PYTHON_VERSION=${python_version}" >> $GITHUB_ENV
-
       - uses: actions/setup-python@v4
         with:
-          python-version: ${{ env.PYTHON_VERSION }}
+          python-version: "3.11"
           cache: poetry
 
-      - name: Install Taglib
-        run: sudo apt-get install -y libtag1-dev
-
       - name: Install Dependencies
         run: poetry install