Bump actions/checkout from 2 to 4 in /.github/workflows

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/citest.yml

@@ -39,7 +39,7 @@ jobs:
  steps:
  - name: Checkout repository
  if: matrix.method == 'native'
- uses: actions/checkout@v2
+ uses: actions/checkout@v4
 
  - name: Setup dependencies
  if: startsWith(matrix.os, 'ubuntu') && matrix.method == 'native'