fix ci

Author: RealZiangLiu

.github/workflows/jekyll.yml

@@ -13,6 +13,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: Update Rubygems
+      run: gem update --system 3.3.22
     - name: Jekyll Actions
       # You may pin to the exact commit or the version.
       # uses: helaili/jekyll-action@d305e465c911226c731afb6db07c8bde20e03ced