Bump actions/checkout from 1 to 2.4.0 (boa-dev#18)

dependabot[bot] · web-flow · commit 7743e2e066b0 · 2022-02-17T19:32:04.000+01:00
Co-authored-by: dependabot[bot] &lt;49699333+dependabot[bot]@users.noreply.github.com&gt;
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2.4.0
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
