ci: fix format deps

Author: juelg

.github/workflows/py.yaml

@@ -11,20 +11,6 @@ on:
       - master
 
 jobs:
-  format:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up Python 3.11
-        uses: actions/setup-python@v5
-        with:
-          python-version: "3.11"
-          cache: "pip"
-      - name: Install linting and formatting dependencies
-        run: python -m pip install -r requirements.txt
-      - name: Check formatting
-        run: make pycheckformat
-
   pythonpackage:
     needs: format
     runs-on: ubuntu-latest
@@ -49,6 +35,8 @@ jobs:
         run: python -m pip install wheel
       - name: Install the package
         run: python -m pip install -v --no-build-isolation '.[dev]'
+      - name: Check formatting
+        run: make pycheckformat
       - name: Code linting
         run: make pylint
       - name: Check that stub files are up-to-date