Fix revolute joints with infinite limits not working in SDF

[Amronos]

Fixes #105.

[Amronos]

I don't really know why the jammy checks are failing, but the noble ones are probably failing because of an error in test_parsing.py or test_flake8.py.
The reasons for the checks failing don't look related to this PR.

[clalancette]

Thanks, #107 should fix the flake8 errors here.

[clalancette]

If you rebase onto the latest code on ros2, the flake8 errors should be fixed.

[Amronos]

Thanks, should be ready to merge now.

[Amronos]

@clalancette Any updates on this PR?

[Amronos]

@clalancette @sloretz friendly ping :-)