[Build] Cleanup gradle

imgui-binding/build.gradle

@@ -11,7 +11,7 @@ sourceCompatibility = 1.8
 
 dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.5.2'
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.5.2")
+    testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.5.2'
 }
 
 test {