Bump actions/labeler from 5 to 6 (#3086)

Bumps [actions/labeler](https://github.com/actions/labeler) from 5 to 6.

- vLLM version: v0.10.2
- vLLM main:
c60e6137f0

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

.github/workflows/labeler.yml

@@ -11,7 +11,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Label the PR
-        uses: actions/labeler@v5
+        uses: actions/labeler@v6
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           configuration-path: .github/labeler.yml