Bump actions/setup-node from 3 to 4

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 3 to 4.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v3...v4)

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

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

.github/workflows/pr-checks.yaml

@@ -45,7 +45,7 @@ jobs:
           # Full git history is needed to get a proper list of changed files within `super-linter`
           fetch-depth: 0
       - name: Setup Node ${{ matrix.node }}
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node }}
       - name: Setup Hugo ${{ matrix.hugo }}
@@ -133,7 +133,7 @@ jobs:
         with:
           site_name: ${{ env.THEME_NAME }}
       - name: Use Node.js 10.x
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: 10.x
       - name: Lighthouse ${{ env.THEME_NAME }} (Preview)