Gradle: Bump mockk from 1.12.3 to 1.12.4

Bumps [mockk](https://github.com/mockk/mockk) from 1.12.3 to 1.12.4.
- [Release notes](https://github.com/mockk/mockk/releases)
- [Commits](mockk/mockk@1.12.3...1.12.4)

---
updated-dependencies:
- dependency-name: io.mockk:mockk
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -201,7 +201,7 @@ subprojects {
     testImplementation(kotlin("test"))
     testImplementation(platform("org.junit:junit-bom:5.8.2"))
     testImplementation("org.junit.jupiter:junit-jupiter")
-    testImplementation("io.mockk:mockk:1.12.3")
+    testImplementation("io.mockk:mockk:1.12.4")
     testImplementation("org.awaitility:awaitility-kotlin:4.2.0")
 
     integrationTestImplementation("org.springframework.boot:spring-boot-starter-test") {