Merge pull request #3979 from rust-lang/renovate/actions-checkout-6.x

Update actions/checkout action to v6.0.3

Author: jieyouxu

.github/workflows/deploy.yml

@@ -12,7 +12,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+    - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
       with:
         fetch-depth: 0
     - name: Install mdbook