Align README example with the Test Action readme by including the che…

…ckout step (#19)

Add checkout step to readme example to align with the example in the
test action readme.

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## Description
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## References
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[OpenFGA RFC](https://github.com/openfga/rfcs), other PRs, etc..) -->

## Review Checklist
- [ ] I have clicked on ["allow edits by
maintainers"](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/allowing-changes-to-a-pull-request-branch-created-from-a-fork).
- [ ] I have added documentation for new/changed functionality in this
PR or in a PR to [openfga.dev](https://github.com/openfga/openfga.dev)
[Provide a link to any relevant PRs in the references section above]
- [ ] The correct base branch is being used, if not `main`
- [ ] I have added tests to validate that the change in functionality is
working as expected

README.md

@@ -34,6 +34,7 @@ jobs:
  name: Deploy Authorization Model
  runs-on: ubuntu-latest
  steps:
+ - uses: actions/checkout@v4
  - name: Deploy using a file
  uses: openfga/[email protected]
  with: