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Update devel/rubygem-prometheus-client-mmap to 0.9.3 required for gitlab 10.8.x.

Description

Update devel/rubygem-prometheus-client-mmap to 0.9.3 required for gitlab 10.8.x.

Reviewed by: swills (mentor)
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D15948