Pin databind package versions in gh-release CI (microsoft#2094)

* Pin databind version

* Pin databind version in gh-release CI

Author: ekzhu

.github/workflows/deploy-website.yml

@@ -87,6 +87,8 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install pydoc-markdown pyyaml termcolor
+          # Pin databind packages as version 4.5.0 is not compatible with pydoc-markdown.
+          pip install databind.core==4.4.2 databind.json==4.4.2
       - name: pydoc-markdown run
         run: |
           pydoc-markdown