ci: bump actions/checkout to v7 (Node.js 20 deprecation)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: uidev1116

.github/workflows/ci.yaml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v7
 
       - name: Install system dependencies
         run: |

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0