chore(deps): bump actions/checkout from 5 to 6 (#36219)

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

.github/workflows/superset-docs-verify.yml

@@ -18,7 +18,7 @@ jobs:
     name: Link Checking
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       # Do not bump this linkinator-action version without opening
       # an ASF Infra ticket to allow the new version first!
       - uses: JustinBeckwith/linkinator-action@3d5ba091319fa7b0ac14703761eebb7d100e6f6d  # v1.11.0
@@ -58,7 +58,7 @@ jobs:
         working-directory: docs
     steps:
       - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           persist-credentials: false
           submodules: recursive