flake8 -> ruff

.github/workflows/unit-tests.yml

@@ -23,9 +23,9 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest tqdm pytest-cov
+        pip install ruff pytest tqdm pytest-cov
         pip install -r requirements.txt
-    - name: Lint with flake8
+    - name: Lint with ruff
       run: |
         # stop the build if there are Python syntax errors or undefined names
         ruff check