apt install python3-enchant instead of just enchant

.github/workflows/ci.yml

@@ -15,9 +15,9 @@ jobs:
         python-version: 3.8
     - name: Install dependencies
       run: |
-        sudo apt update && sudo apt install -y enchant graphviz
+        sudo apt update && sudo apt install -y python3-enchant graphviz
         python -m pip install --upgrade setuptools
-        python -m pip install --upgrade doc8 pyenchant sphinx-rtd-theme sphinxcontrib-spelling
+        python -m pip install --upgrade doc8 sphinx-rtd-theme sphinxcontrib-spelling
     - name: Check spelling
       # show list of misspelled words
       run: |