Auto merge of rust-lang#13446 - trivikr:actions/setup-node@v4, r=flip1995

Update actions/setup-node to v4

changelog: none

Required for using Node.js 20.x in CI
* Changelog for actions/checkout@v4 https://github.com/actions/checkout/blob/main/CHANGELOG.md?rgh-link-date=2024-09-04T18%3A38%3A10Z#v400
* GitHub Blog post https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Example warning: https://github.com/rust-lang/rust-clippy/actions/runs/11003847751
> The following actions use a deprecated Node.js version and will be forced to run on node20: actions/setup-node@v3.

Author: bors

.github/workflows/remark.yml

@@ -19,7 +19,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Setup Node.js
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v4
       with:
         node-version: '18.x'