Bump actions/github-script from 7 to 8 (#5796)

Bumps [actions/github-script](https://github.com/actions/github-script) from 7 to 8.

- vLLM version: v0.13.0
- vLLM main:
2f4e6548ef

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

.github/workflows/pr_close_cancel_job.yaml

@@ -11,7 +11,7 @@ jobs:
   cancel:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/github-script@v7
+      - uses: actions/github-script@v8
         with:
           github-token: ${{ github.token }}
           script: |