Bump io.micrometer:micrometer-registry-prometheus from 1.15.3 to 1.15.4 (#379)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

dp-inntekt-api/build.gradle.kts

@@ -32,7 +32,7 @@ dependencies {
     implementation(libs.ktor.server.auth.jwt)
     implementation(libs.ktor.server.metrics.micrometer)
 
-    implementation("io.micrometer:micrometer-registry-prometheus:1.15.3")
+    implementation("io.micrometer:micrometer-registry-prometheus:1.15.4")
 
     implementation("io.prometheus:client_java:1.4.1")
     implementation("io.prometheus:prometheus-metrics-core:1.4.1")