chore(deps): bump actions/checkout from 6 to 7

.github/workflows/agent-deepseek-e2e.yml

@@ -25,7 +25,7 @@ jobs:
         working-directory: backend
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup Node.js
         uses: actions/setup-node@v6

.github/workflows/backend-agent-regression-gate.yml

@@ -54,7 +54,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup Node.js
         uses: actions/setup-node@v6
@@ -86,7 +86,7 @@ jobs:
         working-directory: backend
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup Node.js
         uses: actions/setup-node@v6
@@ -106,7 +106,7 @@ jobs:
     timeout-minutes: 20
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Build Docker runtime image
         run: docker build -t smartperfetto-runtime-smoke .

.github/workflows/docker-publish.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Setup Node.js
         uses: actions/setup-node@v6
@@ -65,7 +65,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v4

.github/workflows/sync-upstream.yml

@@ -14,7 +14,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout source code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           # 注意：默认的 GITHUB_TOKEN 同步后不会触发其他 workflow（如 Docker 构建）
           # 如果希望同步后自动触发 docker-publish，这里需要配置为 Personal Access Token (PAT)