Change from ignition to gz in garden tutorial sensor example code.

[mikaelmedina]

Signed-off-by: Mikael Medina mikael.medina@hotmail.com

🦟 Bug fix

Fixes #

Summary

• Change from ignition to gz in the tutorial code example for the lidar sensor.

Checklist

• [ ] 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

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[ahcorde]

Thank you @mikaelmedina