Fix dev dep removal in workflow

         with:
           python-version: ${{ matrix.python-version }}
       - name: Remove development dependencies
-        run: sed -i '/\[tool.poetry.group.dev.dependencies\]/,$d' pyproject.toml
+        run: sed -i '/\[tool.poetry.group.dev.dependencies\]/,/\[/d' pyproject.toml
       - name: Install Poetry
         uses: snok/install-poetry@v1
         with: