Merge pull request #1092 from jelmer/fix-apidocs

Build API docs with Python 3.10 for now, until pydoctor catches up.

.github/workflows/docs.yml

@@ -15,6 +15,8 @@ jobs:
       - uses: actions/checkout@v2
       - name: Set up Python
         uses: actions/setup-python@v2
+        with:
+          python-version: "3.10"
       - name: Install pydoctor
         run: |
           sudo apt-get update && sudo apt -y install -y pydoctor python3-pip