Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/render.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: macos-latest
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
       - uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6
         with:
           python-version: '3.14'