build(deps): bump actions/checkout from 2.3.5 to 2.4.0 (#552)

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](https://github.com/actions/checkout/compare/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>

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

.github/workflows/continuous-integration.yaml

@@ -17,7 +17,7 @@ jobs:
     steps:
       -
         name: Checkout code
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
 
       -
         name: Install Go

.github/workflows/release.yaml

@@ -13,7 +13,7 @@ jobs:
     steps:
       -
         name: Checkout code
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
 
       - run: |
           echo "GIT_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
@@ -77,7 +77,7 @@ jobs:
     steps:
       -
         name: Checkout code
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
 
       -
         name: Install Go 1.17.2
@@ -100,7 +100,7 @@ jobs:
     steps:
       -
         name: Checkout code
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
 
       -
         name: Deploy to heroku