Update dependency org.spockframework:spock-junit4 to v2.4-groovy-5.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -18,6 +18,6 @@ kotlin-bom = { module = "org.jetbrains.kotlin:kotlin-bom", version.ref = "kotlin
 kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib-jdk8", version.ref = "kotlin" }
 kotlinx-html = { module = "org.jetbrains.kotlinx:kotlinx-html-jvm", version = "0.12.0" }
 maven-model = { module = "org.apache.maven:maven-model", version = "3.9.16" }
-spock = { module = "org.spockframework:spock-junit4", version = "2.4-M5-groovy-4.0" } # Gradle 9 bundles Groovy 4 via localGroovy()
+spock = { module = "org.spockframework:spock-junit4", version = "2.4-groovy-5.0" } # Gradle 9 bundles Groovy 4 via localGroovy()
 junit-platform-launcher = { module = "org.junit.platform:junit-platform-launcher", version = "6.1.2" } # Gradle 9 no longer auto-provides the launcher
 xmlunit = { module = "org.xmlunit:xmlunit-matchers", version = "2.11.0" }