Update dependency gitlab-exporter to v15.5.0

This MR contains the following updates:

Package	Update	Change
gitlab-exporter	minor	15.4.0 -> 15.5.0

Notes for Reviewer

• For security reasons, our Renovate fork cannot trigger canonical chart pipelines
  • ⚠️ Reviewer needs to initiate new MR pipeline, subsequently triggering chart pipeline from it. ⚠️

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Release Notes

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

v15.5.0

Compare Source

15.5.0 (2025-06-27)

No changes.

Related to gitlab-org/gitlab#550954 (closed)

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Configuration

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