Update dependency gitlab-exporter to v16

This MR contains the following updates:

Package	Update	Change
gitlab-exporter	major	15.6.0 -> 16.1.0

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

gitlab-org/ruby/gems/gitlab-exporter (gitlab-exporter)

v16.1.0

Compare Source

16.1.0 (2025-08-07)

No changes.

v16.0.0

Compare Source

16.0.0 (2025-07-30)

No changes.

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Configuration

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