fix: 잘못된 디스코드 시크릿 참조 수정

Author: lvalentine6

.github/workflows/deploy-dev.yml

@@ -179,12 +179,12 @@ jobs:
           curl -H "Content-Type: application/json" \
             -X POST \
             -d "{\"content\": \"✅ (개발 서버) 새로운 버전이 배포 되었어요!\n레포: ${GITHUB_REPOSITORY}\n브랜치: ${GITHUB_REF}\n버전: ${SEMANTIC_VERSION}\"}" \
-            ${{ secrets.DISCORD_WEBHOOK_URL }}
+            ${{ secrets.DISCORD_WEBHOOK }}
 
       - name: Discord Notify (Failure)
         if: failure()
         run: |
           curl -H "Content-Type: application/json" \
             -X POST \
             -d "{\"content\": \"❌ (개발 서버) 배포 실패!\n레포: ${GITHUB_REPOSITORY}\n브랜치: ${GITHUB_REF}\n버전: ${SEMANTIC_VERSION}\"}" \
-            ${{ secrets.DISCORD_WEBHOOK_URL }}
+            ${{ secrets.DISCORD_WEBHOOK }}