Update Spock to 2.4-M6. (#9326)

Author: AlexeyKuznetsov-DD

dd-java-agent/instrumentation/java-concurrent/java-concurrent-21/build.gradle

@@ -46,6 +46,11 @@ tasks.named("check").configure {
 
 dependencies {
   testImplementation project(':dd-java-agent:instrumentation:trace-annotation')
+
+  // Using Spock 2.4-M6 because it contains fix for deadlock when blocking in mock response generators.
+  // See: https://github.com/spockframework/spock/pull/1910
+  testImplementation libs.spock24.core
+  testImplementation libs.spock24.junit4
 }
 
 // Set all compile tasks to use JDK21 but let instrumentation code targets 1.8 compatibility

gradle/libs.versions.toml

@@ -68,7 +68,7 @@ objenesis = { module = "org.objenesis:objenesis", version = "3.3" } # Used by Sp
 
 spock24-core = { module = "org.spockframework:spock-core", version.ref = "spock24" }
 spock24-junit4 = { module = "org.spockframework:spock-junit4", version.ref = "spock24" }
-spock24-spring = { module = "org.spockframework:spock-spring", version = "spock24" }
+spock24-spring = { module = "org.spockframework:spock-spring", version.ref = "spock24" }
 
 groovy = { module = "org.codehaus.groovy:groovy-all", version.ref = "groovy" }
 groovy-yaml = { module = "org.codehaus.groovy:groovy-yaml", version.ref = "groovy" }