Upgraded gradle and spock

Java-Spock/build.gradle

@@ -1,9 +1,21 @@
-apply plugin: 'groovy'
+apply plugin: "groovy"
 
 repositories {
     mavenCentral()
 }
 
+sourceCompatibility = '1.8'
+targetCompatibility = '1.8'
+
 dependencies {
-  testCompile 'org.spockframework:spock-core:1.0-groovy-2.4'
+    implementation 'org.codehaus.groovy:groovy:3.0.8'
+    testImplementation platform('org.spockframework:spock-bom:2.0-groovy-3.0')
+    testImplementation 'org.spockframework:spock-core'
+}
+
+test {
+    useJUnitPlatform()
+    testLogging {
+        events "passed", "skipped", "failed"
+    }
 }