chore(deps): bump actions/checkout from 2.3.5 to 2.4.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.5 to 2.4.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.5...v2.4.0)

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

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

Author: dependabot[bot]

.github/workflows/rspec_and_release.yml

@@ -15,7 +15,7 @@ jobs:
         ruby: [2.5, 2.6, 2.7, '3.0']
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2.3.5
+    - uses: actions/checkout@v2.4.0
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -31,7 +31,7 @@ jobs:
     env:
       BUNDLE_DEPLOYMENT: true
     steps:
-    - uses: actions/checkout@v2.3.5
+    - uses: actions/checkout@v2.4.0
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with: