Bump to 5.5.8
What does this MR do?
Bump version to fix v5.x integration tests and DB update.
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog trailer added -
Documentation created/updated for GitLab EE, if necessary -
Documentation created/updated for this project, if necessary -
Documentation reviewed by technical writer or follow-up review issue created -
Tests added for this feature/bug -
Job definition updated, if necessary -
Conforms to the code review guidelines -
Conforms to the Go guidelines -
Security reports checked/validated by reviewer