Bump actions/checkout from 2.2.0 to 2.3.4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.2.0 to 2.3.4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.2.0...v2.3.4)

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

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

Author: dependabot[bot]

.github/workflows/main.yml

@@ -24,7 +24,7 @@ jobs:
         os: [ubuntu-18.04, ubuntu-20.04]
     steps:
       - name: "📥 Checkout Code"
-        uses: actions/checkout@v2.2.0
+        uses: actions/checkout@v2.3.4
         with:
           submodules: 'recursive'
           fetch-depth: 0