Bump io.micrometer:micrometer-registry-prometheus from 1.15.3 to 1.15.4

Bumps [io.micrometer:micrometer-registry-prometheus](https://github.com/micrometer-metrics/micrometer) from 1.15.3 to 1.15.4.
- [Release notes](https://github.com/micrometer-metrics/micrometer/releases)
- [Commits](micrometer-metrics/micrometer@v1.15.3...v1.15.4)

---
updated-dependencies:
- dependency-name: io.micrometer:micrometer-registry-prometheus
  dependency-version: 1.15.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle.kts

@@ -11,7 +11,7 @@ val kotlinx_datetime_version = "0.6.2"
 val kompendium_version = "4.0.3"
 val logback_version = "1.5.18"
 val logstash_version = "8.1"
-val prometeus_version = "1.15.3"
+val prometeus_version = "1.15.4"
 val nav_common_version = "3.2025.09.03_08.33-728ff4acbfdb"
 val tjenestespec_version = "1.2021.02.22-10.45-4201aaea72fb"
 val modia_common_utils_version = "1.2025.08.20-10.02-d99e24c2fbbe"