Fix CI: Pin black version and update code

Author: baominghelly

.github/workflows/ci.yml

@@ -33,8 +33,8 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         # Install linting and formatting tools
-        pip install flake8 black
-        
+        pip install flake8 black==23.9.1
+
         # Install project dependencies (if requirements.txt exists)
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi