Merge pull request #19 from gitgitgadget/dependabot/github_actions/actions/checkout-6

build(deps): bump actions/checkout from 5 to 6

Author: dscho

.github/workflows/keepalive.yml

@@ -14,7 +14,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: 'true'
       - name: Merge the upstream default branch