chore: 알림 메시지 수정

Author: dlsrks1021

.github/workflows/slack-notify-pr-open.yml

@@ -15,8 +15,7 @@ jobs:
           SLACK_USERNAME: Github CI
           SLACK_ICON: https://github.com/github.png
           SLACK_COLOR: '#36a64f'
-          SLACK_TITLE: 'New Pull Request 🚀'
+          SLACK_TITLE: 'New Pull Request'
           SLACK_MESSAGE: |
-            🚧 PR #${{ github.event.pull_request.number }} ${{ github.event.pull_request.title }}
-            created by ${{ github.actor }}
+            #${{ github.event.pull_request.number }} ${{ github.event.pull_request.title }}
             🔗 ${{ github.event.pull_request.html_url }}