Update to Groovy 3 + Spock 2

Author: jamierocks

build.gradle.kts

@@ -34,13 +34,12 @@ subprojects {
     }
 
     dependencies {
-        // Standard junit
+        // Standard JUnit
         testImplementation(platform("org.junit:junit-bom:5.7.0"))
         testImplementation("org.junit.jupiter:junit-jupiter-api")
         testImplementation("org.junit.jupiter:junit-jupiter-engine")
 
         // Spock
-        testImplementation("org.junit.vintage:junit-vintage-engine")
         testImplementation("org.codehaus.groovy:groovy-all:$groovyVersion")
         testImplementation("org.spockframework:spock-core:$spockVersion")
     }

gradle.properties

@@ -5,8 +5,8 @@ projectInceptionYear = 2016
 
 # Build Settings
 javaVersion = 1.8
-groovyVersion = 2.5.8
+groovyVersion = 3.0.7
 asmVersion = 7.1
 bombeVersion = 0.5.0-SNAPSHOT
 junitVersion = 5.5.1
-spockVersion = 1.3-groovy-2.5
+spockVersion = 2.0-M4-groovy-3.0