Fix compilation for Ubuntu 22.04 (Humble)

[Rayman]

On humble we have libgtest-dev at version 1.11.0-3 but this package restricts gtest to 1.12 or higher. If you remove this version restriction, this package can also be used on Humble.

[flipflip8952]

This is fixposition-sdk dependency, which is why we install gtest 1.13 "manually": https://github.com/fixposition/fixposition-sdk/blob/main/docker/scripts/install_gtest.sh for those systems (Docker images) that come with an earlier one, such as Ubuntu 22 (https://github.com/fixposition/fixposition-sdk/blob/main/docker/Dockerfile.humble-base#L34).

You can skip the testing by using the FPSDK_BUILD_TESTING=OFF CMake option.

Does that work for you?

[Rayman]

Yes I see that a higher version is installed. But this is not needed. All tests run fine with gtest 1.11

docker run -it --volume .:/ws ros:humble
rosdep install --from-path . -i -y
colcon build --cmake-args -DBUILD_TESTING=ON
colcon test --event-handlers console_direct+
100% tests passed, 0 tests failed out of 197
apt list --installed | grep gtest
libgtest-dev/jammy,now 1.11.0-3 amd64 [installed,automatic]

[flipflip8952]

I believe there are other (non-public) branches/versions of fixposition-sdk that do need a more recent gtest. That's why it explicitly asks for at least this version. I'll investigate this a bit more at some time, perhaps we can set it to >= 1.11

For the time being please either upgrade your gtest or build with FPSDK_BUILD_TESTING=OFF or build using your branch.