[ci] Bump actions/checkout to v4 (#5736)

Co-authored-by: Ryan Blue <ryanzblue@gmail.com>

.github/workflows/comment-command.yml

@@ -19,12 +19,12 @@ jobs:
               comment_id: context.payload.comment.id,
               content: "rocket",
             });
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
+          fetch-depth: 0
           token: ${{ secrets.COMMENT_COMMAND_PAT_TOKEN }}
       - name: Fetch all history and metadata
         run: |
-          git fetch --prune --unshallow
           git checkout -b pr
           git branch -f main origin/main
       - name: Checkout PR