Build(deps): Bump org.junit.jupiter:junit-jupiter in /libcobj

Bumps [org.junit.jupiter:junit-jupiter](https://github.com/junit-team/junit-framework) from 5.13.4 to 6.0.0.
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r5.13.4...r6.0.0)

---
updated-dependencies:
- dependency-name: org.junit.jupiter:junit-jupiter
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

libcobj/app/build.gradle.kts

@@ -34,7 +34,7 @@ dependencies {
     implementation("com.google.guava:guava:33.5.0-jre")
     implementation("org.xerial:sqlite-jdbc:3.50.3.0")
     implementation("commons-cli:commons-cli:1.10.0")
-    testImplementation("org.junit.jupiter:junit-jupiter:5.13.4")
+    testImplementation("org.junit.jupiter:junit-jupiter:6.0.0")
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
     implementation("org.json:json:20250517")
     spotbugs("com.github.spotbugs:spotbugs:4.8.6")