Bump io.ktor:ktor-server-test-host from 2.3.7 to 2.3.8

Bumps [io.ktor:ktor-server-test-host](https://github.com/ktorio/ktor) from 2.3.7 to 2.3.8.
- [Release notes](https://github.com/ktorio/ktor/releases)
- [Changelog](https://github.com/ktorio/ktor/blob/2.3.8/CHANGELOG.md)
- [Commits](ktorio/ktor@2.3.7...2.3.8)

---
updated-dependencies:
- dependency-name: io.ktor:ktor-server-test-host
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -1,6 +1,6 @@
 val javaVersion = JavaVersion.VERSION_21
 val prometheusVersion = "0.15.0"
-val ktorVersion = "2.3.7"
+val ktorVersion = "2.3.8"
 val jacksonVersion = "2.14.1"
 val mockkVersion = "1.13.9"
 val kotestVersion = "5.8.0"