Bump actions/setup-node from 5.0.0 to 6.0.0

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@a0853c2...2028fbc)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/main-build.yml

@@ -30,7 +30,7 @@ jobs:
           distribution: temurin
       # vaadin 14 tests fail with node 18
       - name: Set up Node
-        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 #v5.0.0
+        uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 #v6.0.0
         with:
           node-version: 16
 

.github/workflows/pr-build.yml

@@ -81,7 +81,7 @@ jobs:
           distribution: temurin
       # vaadin 14 tests fail with node 18
       - name: Set up Node
-        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0
+        uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6.0.0
         with:
           node-version: 16