Pin Black version to 25.9.0 in CI

Author: francois-drielsma

.github/workflows/ci.yml

@@ -287,7 +287,7 @@ jobs:
     - name: Install quality tools
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 black isort mypy
+        pip install flake8 black==25.9.0 isort mypy
         pip install -e .
 
     - name: Run Black