Update docs.yml

Author: tomvanmele

.github/workflows/docs.yml

@@ -27,15 +27,10 @@ jobs:
           channels: conda-forge
           python-version: 3.8
 
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install cython --install-option="--no-cython-compile"
-
       - name: Install
         run: |
-          conda install graphviz
-          python -m pip install --no-cache-dir -r requirements-dev.txt
+          conda install cython graphviz
+          python -m pip install -r requirements-dev.txt
 
       - name: Generate docs
         if: ${{ success() }}