go bump 1.11.1 -> 1.11.2
go bump 1.11.1 -> 1.11.2

[#161705324](https://www.pivotaltracker.com/story/show/161705324)

Signed-off-by: Nima Kaviani <0ebde517669f70c2aec92dc89d4950413b825ec0@us.ibm.com>

cloudfoundry-incubator/diego-dockerfiles,cloudfoundry-incubator/diego-dockerfiles