[Infrastructure] Bump actions/labeler from 5 to 6 (AliceO2Group#12894)

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

Author: dependabot[bot]

.github/workflows/labeler.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       - name: Label the PR
         id: labeler
-        uses: actions/labeler@v5
+        uses: actions/labeler@v6
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           sync-labels: true