Bump mockito-kotlin from 3.1.0 to 4.0.0

Bumps [mockito-kotlin](https://github.com/mockito/mockito-kotlin) from 3.1.0 to 4.0.0.
- [Release notes](https://github.com/mockito/mockito-kotlin/releases)
- [Commits](mockito/mockito-kotlin@3.1.0...4.0.0)

---
updated-dependencies:
- dependency-name: org.mockito.kotlin:mockito-kotlin
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

build.gradle.kts

@@ -54,7 +54,7 @@ dependencies {
     testImplementation("org.springframework.security:spring-security-oauth2-client")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
     testImplementation("org.springframework.security:spring-security-test")
-    testImplementation("org.mockito.kotlin:mockito-kotlin:3.1.0")
+    testImplementation("org.mockito.kotlin:mockito-kotlin:4.0.0")
     testImplementation("io.projectreactor:reactor-test")
     testImplementation("org.mock-server:mockserver-netty:5.11.2")
     testImplementation("org.mock-server:mockserver-client-java:5.11.2")