Fix CI to use pyproject.toml

Author: RyanLua

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip pylint black mypy sphinx-lint
-        pip install -r requirements.txt
+        pip install .
 
     - name: Run Pylint
       run: |