Bump actions/setup-node from 6.0.0 to 6.4.0 (#354)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 6.0.0 to 6.4.0.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@2028fbc...48b55a0)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/test.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
       - name: Use Node.js LTS (22.x)
-        uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e
         with:
           node-version: '22'
       - run: npm install @abaplint/cli -g