Gradle: Bump junit-bom from 5.8.2 to 5.9.0

Bumps [junit-bom](https://github.com/junit-team/junit5) from 5.8.2 to 5.9.0.
- [Release notes](https://github.com/junit-team/junit5/releases)
- [Commits](junit-team/junit-framework@r5.8.2...r5.9.0)

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

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

Author: dependabot[bot]

build.gradle.kts

@@ -198,7 +198,7 @@ subprojects {
     implementation("com.okta.spring:okta-spring-boot-starter:${oktaSpringBootVersion}")
 
     testImplementation(kotlin("test"))
-    testImplementation(platform("org.junit:junit-bom:5.8.2"))
+    testImplementation(platform("org.junit:junit-bom:5.9.0"))
     testImplementation("org.junit.jupiter:junit-jupiter")
     testImplementation("io.mockk:mockk:1.12.5")
     testImplementation("org.awaitility:awaitility-kotlin:4.2.0")