Update cimg/base Docker tag to v2020.09
Update cimg/base Docker tag to v2020.09

artsy/force,joeyAghion/force,joeyAghion/force,joeyAghion/force,artsy/force,joeyAghion/force,eessex/force,artsy/force-public,artsy/force-public,artsy/force,artsy/force,eessex/force,eessex/force,eessex/force