remove unused setup-node (#27)

Author: tnyo43

action.yml

@@ -22,10 +22,6 @@ runs:
   steps:
     - uses: actions/checkout@v4
       if: github.event_name != 'issue_comment' || github.event.issue.pull_request
-    - uses: actions/setup-node@v3
-      with:
-        node-version-file: '.node-version'
-      if: github.event_name != 'issue_comment' || github.event.issue.pull_request
     - run: 'node ${GITHUB_ACTION_PATH}/dist/index.js'
       shell: bash
       env: