⚡️ chore: change the version of Node.js

- may make the tool relatively stable

Author: C-Naoki

action.yml

@@ -23,9 +23,9 @@ runs:
   using: "composite"
   steps:
     - name: Setup Node.js
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v3
       with:
-        node-version: '21'
+        node-version: '20'
 
     - name: Get changed markdown files
       id: files