fix import error

.github/workflows/python-package.yml

@@ -32,7 +32,7 @@ jobs:
                 python-version: ${{ matrix.python-version }}
             - name: Install Python dependencies
               run: |
-                python -m pip install --upgrade pip wheel
+                python -m pip install --upgrade pip setuptools wheel
                 python -m pip install pytest jinja2
                 python -m pip install numpy\<1.23
                 python -m pip install "git+https://github.com/desihub/desiutil.git@${{ matrix.desiutil-version }}#egg=desiutil"
@@ -61,7 +61,7 @@ jobs:
                 python-version: ${{ matrix.python-version }}
             - name: Install Python dependencies
               run: |
-                python -m pip install --upgrade pip wheel
+                python -m pip install --upgrade pip setuptools wheel
                 python -m pip install pytest pytest-cov coveralls
                 python -m pip install -r requirements.txt
                 python -m pip install --upgrade numpy\<1.23
@@ -95,8 +95,8 @@ jobs:
                 python-version: ${{ matrix.python-version }}
             - name: Install Python dependencies
               run: |
-                python -m pip install --upgrade pip wheel
-                python -m pip install Sphinx sphinx-toolbox
+                python -m pip install --upgrade pip setuptools wheel
+                python -m pip install -r doc/rtd-requirements.txt
             - name: Test the documentation
               env:
                 PYTHONPATH: ${{ github.workspace }}/py
@@ -153,7 +153,7 @@ jobs:
                 python-version: ${{ matrix.python-version }}
             - name: Install Python dependencies
               run: |
-                python -m pip install --upgrade pip wheel
+                python -m pip install --upgrade pip setuptools wheel
                 python -m pip install pycodestyle
             - name: Test the style
               # This is equivalent to an allowed falure.