use latest checkout action

https://github.com/actions/checkout?tab=readme-ov-file#checkout-v5

Author: tshepang

src/doc/rustc-dev-guide/.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
       BASE_SHA: ${{ github.event.pull_request.base.sha }}
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           # linkcheck needs the base commit.
           fetch-depth: 0

src/doc/rustc-dev-guide/.github/workflows/date-check.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Ensure Rust is up-to-date
         run: |