chore(deps): update actions/checkout action to v6 (#1450)

Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

Author: thomhurst

.github/workflows/claude-code-review.yml

@@ -19,7 +19,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 1