chore: simplify format to run only in one version

Author: remyleone

.github/workflows/checks.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: '3.13'
           cache: "poetry"
       - name: Install dependencies and library
         run: poetry install