Merge pull request #119 from buildkite-plugins/renovate/actions-checkout-6.x

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

Author: scadu

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0