Bump io.github.classgraph:classgraph in /java-client

Bumps [io.github.classgraph:classgraph](https://github.com/classgraph/classgraph) from 4.8.165 to 4.8.168.
- [Release notes](https://github.com/classgraph/classgraph/releases)
- [Commits](classgraph/classgraph@classgraph-4.8.165...classgraph-4.8.168)

---
updated-dependencies:
- dependency-name: io.github.classgraph:classgraph
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

java-client/build.gradle.kts

@@ -216,7 +216,7 @@ dependencies {
     implementation("org.eclipse", "yasson", "2.0.2")
 
     // https://github.com/classgraph/classgraph
-    testImplementation("io.github.classgraph:classgraph:4.8.165")
+    testImplementation("io.github.classgraph:classgraph:4.8.168")
 
     // Eclipse 1.0
     testImplementation("junit", "junit" , "4.13.2") {