chore(deps): bump org.junit:junit-bom in /flipt-java

Bumps [org.junit:junit-bom](https://github.com/junit-team/junit-framework) from 5.11.4 to 6.0.1.
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r5.11.4...r6.0.1)

---
updated-dependencies:
- dependency-name: org.junit:junit-bom
  dependency-version: 6.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

flipt-java/build.gradle

@@ -27,7 +27,7 @@ dependencies {
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.20.0'
     implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.20.0'
     implementation 'com.squareup.okhttp3:okhttp:5.2.1'
-    testImplementation platform('org.junit:junit-bom:5.11.4')
+    testImplementation platform('org.junit:junit-bom:6.0.1')
     testImplementation 'org.junit.jupiter:junit-jupiter'
     api 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.20.0'
     api 'com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.19.2'