fix: resolve CI/CD workflow issues

- Changed Python version to 3.11 for consistency
- Added pip caching for faster builds
- Fixed pytest commands to use python -m pytest

.gitea/workflows/ci.yml

@@ -16,7 +16,15 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.11'
+
+      - name: Cache pip packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/setup.py') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
 
       - name: Install dependencies
         run: |
@@ -25,7 +33,7 @@ jobs:
           pip install pytest pytest-cov
 
       - name: Run tests
-        run: pytest tests/ -v --tb=short
+        run: python -m pytest tests/ -v --tb=short
 
       - name: Check code coverage
-        run: pytest tests/ --cov=src --cov-report=term-missing
+        run: python -m pytest tests/ --cov=src --cov-report=term-missing