chore(deps): update actions/checkout action to v6 (#225)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
 
     steps:
       - name: Check out code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Install Chef
         uses: actionshub/chef-install@3.0.1
       - name: test-kitchen

.github/workflows/copilot-setup-steps.yml

@@ -17,7 +17,7 @@ jobs:
       contents: read
     steps:
       - name: Check out code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Install Chef
         uses: actionshub/chef-install@main
       - name: Install cookbooks