Bump org.mockito:mockito-core from 5.8.0 to 5.9.0

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.8.0 to 5.9.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.8.0...v5.9.0)

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

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

build.gradle.kts

@@ -103,7 +103,7 @@ subprojects {
         compileOnly("org.jetbrains:annotations:24.1.0")
 
         testImplementation("org.junit.jupiter:junit-jupiter:5.10.1")
-        testImplementation("org.mockito:mockito-core:5.8.0")
+        testImplementation("org.mockito:mockito-core:5.9.0")
 
         testImplementation("org.spigotmc:spigot-api:1.9-R0.1-SNAPSHOT")
         testImplementation("net.md-5:bungeecord-chat:1.20-R0.1")