devops: Specify the version of ubuntu in GitHub Actions to be compatible with rruby version.

Author: CptGit

.github/workflows/jekyll.yml

@@ -31,7 +31,7 @@ concurrency:
 jobs:
   # Build job
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v3