Bump Ruby to 2.3.7 and git to 2.17.0 in CI image
Since we'll be updating to Ruby 2.3.7 soon, we'll want to run CI through it. Bump git 2.17 as well to catch any particular upgrade issues as well.
Since we'll be updating to Ruby 2.3.7 soon, we'll want to run CI through it. Bump git 2.17 as well to catch any particular upgrade issues as well.