Upgrade cmake minimum version to 2.8.12

[brawner]

In the most recent release of cmake (3.19), they have started deprecating cmake versions < 2.8.12.

Example cmake warnings
https://ci.ros2.org/view/nightly/job/nightly_win_rel/1760/cmake/

Build all of ros2, testing up to rcutils

• Linux
• Linux-aarch64
• macOS
• Windows

Signed-off-by: Stephen Brawner brawner@gmail.com

[sloretz]

Looks like a typo with CI: 6 __main__.py: error: unrecognized arguments: --package-up-to. Retriggered

build: all of ROS 2; test: --packages-up-to rcutils

• Linux
• Linux-aarch64
• macOS
• Windows

[sloretz]

LGTM with green CI

[sloretz]

@brawner was that CI meant to cover all the PRs? I still see some windows warnings about the minimum required version.

[brawner]

Thanks Shane for rerunning the CI. I was hoping to get all the cmake warnings but it appears I missed some. It looks like urdfdom_headers has been taken care of though. It's hard to tell because jenkins doesn't categorize it correctly, but it's one of the 4 resolved cmake warnings.

I think this PR will need to be backported otherwise we'll continue getting the same issues when running foxy jobs on CI.

@sloretz Are you able to merge this PR? I don't have privileges in the ros org.