Bump gem_publisher to 1.1.1
Bump gem_publisher to 1.1.1

This needs to occur as otherwise Jenkins will wrongly mark builds
RED due to the publishing of an older gem failing. This is because
it can't complete the building of said version as a previously green
build claimed it.

theodi/gds-api-adapters,bitzesty/gds-api-adapters,alphagov/gds-api-adapters,theodi/gds-api-adapters,bitzesty/gds-api-adapters