Bump micrometer.version from 1.5.5 to 1.5.6
Bump micrometer.version from 1.5.5 to 1.5.6

Bumps `micrometer.version` from 1.5.5 to 1.5.6.

Updates `micrometer-bom` 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)

Updates `micrometer-registry-stackdriver` 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)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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