Bump io.micrometer:micrometer-registry-otlp in /modules/grafana

Bumps [io.micrometer:micrometer-registry-otlp](https://github.com/micrometer-metrics/micrometer) from 1.16.1 to 1.16.4.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](https://github.com/micrometer-metrics/micrometer/compare/v1.16.1...v1.16.4)

---
updated-dependencies:
- dependency-name: io.micrometer:micrometer-registry-otlp
  dependency-version: 1.16.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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