Update gem to 2.7.9 (#6265)

New bundler doesn't work with old gem: https://github.com/rbenv/rbenv/issues/1138
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Paul Yang 2019-06-17 09:53:12 -07:00 committed by GitHub
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FROM grpctesting/rake-compiler-dock_53c22085d091183c528303791e7771359f699bcf
RUN /bin/bash -l -c "gem install bundler"
RUN /bin/bash -l -c "gem update --system '2.7.9' && gem install bundler"