ci: fix docs dependency

Author: yunwei37

.github/workflows/trigger-sync.yml

@@ -53,6 +53,8 @@ jobs:
         run: |
           pip install mkdocs-material=="9.*" mkdocs-static-i18n=="0.53"
           pip install "mkdocs-material[imaging]"
+          pip install mkdocs-git-revision-date-localized-plugin
+          pip install mkdocs-git-authors-plugin
 
       - name: Test page build
         run: |