Bump actions/checkout from 3.5.3 to 4.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.5.3 to 4.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@c85c95e...3df4ab1)

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

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

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
-      - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
       - uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe
         with:
@@ -37,7 +37,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
       - name: Check formatting
         run: ./.gha.gofmt.sh