[data-plane]: Bump micrometer-bom from 1.5.5 to 1.5.6 in /data-plane (#360)
[data-plane]: Bump micrometer-bom from 1.5.5 to 1.5.6 in /data-plane (#360)

Bumps [micrometer-bom](https://github.com/micrometer-metrics/micrometer) from 1.5.5 to 1.5.6.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](https://github.com/micrometer-metrics/micrometer/compare/v1.5.5...v1.5.6)

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Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
knative-sandbox/eventing-kafka-broker,knative-sandbox/eventing-kafka-broker,knative-sandbox/eventing-kafka-broker