Bump actions/setup-node from 2.1.5 to 2.4.0 (#37619)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 2.1.5 to 2.4.0.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v2.1.5...v2.4.0)

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

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

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

.github/workflows/bump-version.yml

@@ -53,7 +53,7 @@ jobs:
           repository: "grafana/grafana-github-actions"
           path: ./actions
           ref: main
-      - uses: actions/setup-node@v2.1.5
+      - uses: actions/setup-node@v2.4.0
         with:
           node-version: '14'
       - name: Install Actions

.github/workflows/publish.yml

@@ -21,7 +21,7 @@ jobs:
         path: '**/node_modules'
         key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}
     - name: generate-packages-docs
-      uses: actions/setup-node@v2.1.5
+      uses: actions/setup-node@v2.4.0
       id: generate-docs
       with:
         node-version: '14'