Merge pull request #3702 from rust-lang/renovate/actions-checkout-4.x

Update actions/checkout action to v4.2.0

Author: ehuss

.github/workflows/deploy.yml

@@ -12,7 +12,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+    - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
       with:
         fetch-depth: 0
     - name: Install mdbook