devel/rubygem-gitlab-labkit: update to 0.31.0
Required for gitlab-ce 15.9
Changelog:
https://gitlab.com/gitlab-org/ruby/gems/labkit-ruby/-/releases
Changes in v0.31.0
!107: Include context data in all log messages
(cherry picked from commit 31a54c61bfaf701f8820d1389416fb46451571db)