Raw strings in cmakelint.py.
Raw strings in cmakelint.py.

This fixes DeprecationWarning on Windows.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@openrobotics.org>

ament/ament_lint,ament/ament_lint,ament/ament_lint