Fix use_respawn argument causing errors

[Amronos]

🦟 Bug fix

Fixes #650.

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

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[ahcorde]

@caguero do we need to backport this to jazzy ?

[caguero]

https://github.com/Mergifyio backport jazzy

[mergify[bot]]

backport jazzy

✅ Backports have been created

* [#654 Fix use_respawn argument causing errors (backport #651)](https://github.com/gazebosim/ros_gz/pull/654) has been created for branch `jazzy`