ci(github): use node 18.x in maintain-project workflow

Author: GitHub

.github/workflows/maintain-project.yml

@@ -2,9 +2,9 @@ name: Maintain Project
 on:
   schedule:
     - cron: 5 0 1 * *
-  workflow_dispatch:
+  workflow_dispatch: null
 env:
-  NODE_VERSION: 17.x
+  NODE_VERSION: 18.x
 jobs:
   maintain-project:
     name: Maintain Project