ci: update workflow to use Node.js 22 only

Author: monkey0722

.github/workflows/blank.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [20, 22]
+        node: [22]
     timeout-minutes: 30
     steps:
       - name: checkout pushed commit