Fix init script tests dependencies

Author: jprinet

sources/test/init-scripts/build.gradle

@@ -14,13 +14,15 @@ repositories {
 
 dependencies {
     testImplementation gradleTestKit()
-    testImplementation 'org.spockframework:spock-core:2.3-groovy-3.0'
-    testImplementation('org.spockframework:spock-junit4:2.3-groovy-3.0')
+    testImplementation 'org.spockframework:spock-core:2.3-groovy-4.0'
+    testImplementation('org.spockframework:spock-junit4:2.3-groovy-4.0')
 
     testImplementation ('io.ratpack:ratpack-groovy-test:1.9.0') {
         exclude group: 'org.codehaus.groovy', module: 'groovy-all'
     }
     testImplementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-smile:2.19.2'
+
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }
 
 test {