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](https://github.com/actions/checkout/compare/1e204e9a9253d643386038d443f96446fa156a97...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>
Change-Id: I129ef5d6fbf628f6a0f2bbd796bfa0efc337ba30
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ff0143b..3d9d22b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@
     runs-on: ubuntu-latest
     steps:
       - name: Checkout master
-        uses: actions/checkout@1e204e9a9253d643386038d443f96446fa156a97 #2.3.5
+        uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 #2.4.0
         with:
           fetch-depth: 0