ci: Bump actions/setup-node from 4.0.2 to 6.3.0

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 4.0.2 to 6.3.0.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@60edb5d...53b8394)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: 6.3.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
           ocaml-compiler: "5.1"
 
       - name: Set up Node.js
-        uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4
+        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v4
         with:
           node-version: "20"