Flaky unit test

[carlcsaposs-canonical]

https://github.com/canonical/mysql-router-k8s-operator/actions/runs/7030050583/job/19130154839

can't reproduce locally or on CI

[github-actions]

https://warthogs.atlassian.net/browse/DPE-3071

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/DPE-8054.

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