fix: use only poetry in ci

.github/workflows/ci.yml

@@ -23,8 +23,9 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install ruff mypy
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+        pip install poetry
+        poetry install
+
     - name: Format with ruff
       run: |
         ruff format .
@@ -33,11 +34,8 @@ jobs:
       run: |
         ruff check .
 
-    - name: Install missing type stubs for mypy
-      run: mypy --install-types --non-interactive
-
     - name: Type check with mypy
-      run: mypy .
+      run: poetry mypy .
 
     - name: Test with unittest
       run: |