build(deps): bump actions/checkout from 2 to 2.3.4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 2.3.4.
- [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...v2.3.4)

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

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
             ref: import/4.18.0-1ubuntu2_ubuntu18.04.1
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
       - name: Clone repo
         run: git clone --depth=1 ${{matrix.repo}} -b ${{matrix.ref}} ${{matrix.package}}
       - name: Test run