Upgrade to Spock 2.4

Closes gh-105

Author: rainboyan

buildSrc/src/main/groovy/grace.build.common.gradle

@@ -46,9 +46,7 @@ dependencies {
     testImplementation libs.junit.jupiter.engine
     testImplementation libs.junit.platform.runner
     testImplementation libs.slf4j.simple
-    testImplementation libs.spock.core, {
-        transitive = false
-    }
+    testImplementation libs.spock.core
 
     documentation libs.javaparser
     documentation libs.groovy.ant

gradle/libs.versions.toml

@@ -14,7 +14,7 @@ rxjava = "1.3.8"
 rxjava2 = "2.2.21"
 rxjava3 = "3.1.12"
 slf4j = "2.0.18"
-spock = "2.3-groovy-4.0"
+spock = "2.4-groovy-4.0"
 
 [libraries]
 bytebuddy = { module = "net.bytebuddy:byte-buddy", version.ref = "bytebuddy" }