Bump actions/setup-node from 4 to 6 (#1722)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 4 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v4...v6)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/rust.yml

@@ -167,7 +167,7 @@ jobs:
       - name: Launch darwinia
         run: darwinia --chain darwinia-dev --tmp --alice --unsafe-force-node-key-generation --tracing-api debug,trace --frontier-backend-type sql &
       - name: Install Node 19
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 19
       - name: Fetch latest code