Merge pull request #17 from bgilbert/workflows

workflows: update actions/checkout to v6

Author: bgilbert

.github/workflows/dco-check.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-slim
     steps:
     - name: Check out repo
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Install dco-check
       run: pip install dco-check
     - name: Check signoffs