Bump actions/checkout from 4 to 6 (#1)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Configure Git Credentials
         run: |
           git config user.name github-actions[bot]