ci: update GitHub Actions and Python version, fix ruby-version typo

.github/workflows/pr-build-check.yml

@@ -42,7 +42,7 @@ jobs:
 
     steps:
       - name: Clone Repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Build Environment
         uses: ./.github/actions/setup-build-environment