ci(deploy): Checkout 단계를 actions/checkout@v4로 개선

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -12,9 +12,7 @@ jobs:
       image: maven:3.9-eclipse-temurin-17
     steps:
       - name: Checkout
-        run: |
-          git clone --depth=1 --branch=${GITHUB_REF_NAME} \
-            http://gitea:3000/${GITHUB_REPOSITORY}.git .
+        uses: actions/checkout@v4
 
       - name: Configure Maven settings
         run: |