ci: Update nokogiri to 1.11.x
Nokogiri (Ruby library) 1.11.0+ is now shipped as native gems, which contain pre-compiled for Linux. https://nokogiri.org/CHANGELOG.html#1110-2021-01-03
Nokogiri was depended on by google_drive 2.x (note: google_drive 3.x does not depend on it
With pre-build nokogiri, we will make the pipeline faster. For example: https://gitlab.com/gitlab-org/omnibus-gitlab/-/jobs/1177799702
Part of &5681 (closed)
cf. #3640 (closed)
Edited by Takuya Noguchi