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Since ros/catkin#1048 catkin prefers to use setuptools instead of distutils. The package.xml doesn't need to include python3-setuptools because catkin exports that dependency for the convenience of all downstream python packages.
This bumps the minimum CMake version to 3.0.2, which is the minimum supported by ROS Kinetic and new enough to default to the NEW behavior of CMP0048. This avoids a CMake warning when building and testing this package in Debian Buster and Ubuntu Focal.