ci: install dependencies with pip on Windows

.github/workflows/tests.yml

@@ -18,20 +18,22 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Install Poetry
-        run: pipx install poetry
       - name: Install dependencies
-        run: poetry install
+        shell: bash
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --require-hashes -r requirements.lock
+          python -m pip install black pip-audit coverage
       - name: Check formatting
-        run: poetry run black --check .
+        run: black --check .
       - name: Run security audit
         run: |
-          poetry run pip-audit || echo "::warning::pip-audit found vulnerabilities"
+          pip-audit || echo "::warning::pip-audit found vulnerabilities"
         shell: bash
       - name: Run tests with coverage
         run: |
-          poetry run coverage run -m pytest
-          poetry run coverage xml
+          coverage run -m pytest
+          coverage xml
       - name: Upload coverage report
         uses: actions/upload-artifact@v4
         with: