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](https://github.com/actions/checkout/compare/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>

op-node: Default to no netrestrict instead of allow none

Op service : http util cleanup

op-challenger: Fix error in make alphabet

When p2p.netrestrict was not set, the empty string was being used as the list of allowed nodes, thus preventing any peers from connecting.

docs: minor doc fixes

🐛 fix: remove git dep from docker build

feat(indexer): index service /healthz endpoint

op-challenger: Add instructions for running against the devnet.

op-challenger: Don't try to perform moves on resolvable games.

op-challenger: Add a script to resolve games

feat(ufm): track nonce locally

feat(op-challenger): Record Cannon Execution Time

op-program: Retrying fetching if preimage disappears between fetching and retrying read

op-challenger: Make scripts more flexible