Bump actions/checkout from 4.3.1 to 6.0.0 (#4592)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.3.1 to 6.0.0.

- vLLM version: v0.11.2

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

.github/workflows/vllm_ascend_test_pr_full.yaml

@@ -44,7 +44,7 @@ jobs:
       e2e_tracker: ${{ steps.filter.outputs.e2e_tracker }}
       ut_tracker: ${{ steps.filter.outputs.ut_tracker }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v6.0.0
       - uses: dorny/paths-filter@v3
         id: filter
         with: