Update micrometer-core to 1.9.9

[scala-steward]

Updates io.micrometer:micrometer-core from 1.9.0 to 1.9.9. GitHub Release Notes

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Adjust future updates

Add this to your `.scala-steward.conf` file to ignore future updates of this dependency: ``` updates.ignore = [ { groupId = "io.micrometer", artifactId = "micrometer-core" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "30 days" }, dependency = { groupId = "io.micrometer", artifactId = "micrometer-core" } }] ```

labels: library-update, early-semver-patch, semver-spec-patch, commit-count:1