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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ axionRelease = "1.18.18"
 groovy = "4.0.29"
 rundeckCore = "6.0.0-alpha1-20260407"
 nexusPublish = "2.0.0"
-spock = "2.4-groovy-4.0"
+spock = "2.4-groovy-5.0"
 # Security overrides for transitive dependencies
 commonsLang3 = "3.20.0"