chore(deps): pin actions/checkout action to df4cb1c

Signed-off-by: red-hat-konflux <126015336+red-hat-konflux[bot]@users.noreply.github.com>

Author: red-hat-konflux[bot]

.github/workflows/lint.yaml

@@ -230,7 +230,7 @@ jobs:
   check-renovate-config-file:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
       - uses: konflux-ci/renovate-config-validator-action@main
         with:
           config_file: .github/renovate.json