chore(gradle): bump org.wiremock:wiremock in /mock-api

Bumps [org.wiremock:wiremock](https://github.com/wiremock/wiremock) from 3.11.0 to 3.12.0.
- [Release notes](https://github.com/wiremock/wiremock/releases)
- [Commits](wiremock/wiremock@3.11.0...3.12.0)

---
updated-dependencies:
- dependency-name: org.wiremock:wiremock
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

mock-api/build.gradle.kts

@@ -13,7 +13,7 @@ dependencies {
     implementation("org.http4k:http4k-core")
     implementation("org.http4k:http4k-client-apache")
 
-    implementation("org.wiremock:wiremock:3.11.0")
+    implementation("org.wiremock:wiremock:3.12.0")
     implementation("io.github.oshai:kotlin-logging-jvm:7.0.4")
     implementation("org.slf4j:slf4j-simple:2.0.16")
 }