Bump actions/checkout from 5 to 6 (#315)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/main.yaml

@@ -12,7 +12,7 @@ jobs:
     name: Mirror
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - run: git config --global user.name 'Github Actions'
       - run: git config --global user.email '41898282+github-actions[bot]@users.noreply.github.com'
       - name: Install the latest version of uv