build(deps): bump actions/checkout from 2 to 2.4.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 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...ec3a7ce113134d7a93b817d10a8272cb61118579)

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

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

.github/workflows/build_test.yml

@@ -30,6 +30,6 @@ jobs:
     env: ${{ matrix.env }}
     steps:
       - name: Repository checkout
-        uses: actions/checkout@1e204e9a9253d643386038d443f96446fa156a97
+        uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
       - name: Build check (${{ env.COMPILER }}-${{ env.COMPILER_VERSION }})
         run: sudo -E .github/workflows/build_test.sh