Upgrade grpc gem to 1.15.x
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gitlab-ce: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22350 -
gitaly-ruby: gitaly!918 (merged)
Follow-up to https://gitlab.com/gitlab-org/gitlab-ce/issues/39928
Edited by Alejandro Rodríguez
Follow-up to https://gitlab.com/gitlab-org/gitlab-ce/issues/39928