Bump actions/setup-node from 2.3.2 to 2.4.0

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 2.3.2 to 2.4.0.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v2.3.2...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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2.3.4
-      - uses: actions/setup-node@v2.3.2
+      - uses: actions/setup-node@v2.4.0
         with:
           node-version: '12.x'
       - run: npm install -g standard

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
   npm:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-node@v2.3.2
+      - uses: actions/setup-node@v2.4.0
       - uses: actions/setup-python@v2.2.2
       - uses: actions/checkout@v2.3.4
       - run: python set_version.py