Bump actions/checkout from 2 to 4

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] <support@github.com>

.github/workflows/coverage.yml

@@ -16,7 +16,7 @@ jobs:
     container:
       image: perl:stable
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - run: cpanm --quiet --notest --installdeps .
       - run: cpanm --quiet --notest App::Yath Devel::Cover Devel::Cover::Report::Coveralls
       - run: PERL5OPT=-MDevel::Cover yath test --qvf t/