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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -9,7 +9,7 @@ rundeckCore = "6.0.0-alpha1-20260407"
 slf4j = "2.0.17"
 junit = "4.13.2"
 groovy = "4.0.31"
-spock = "2.4-groovy-4.0"
+spock = "2.4-groovy-5.0"
 cglib = "3.3.0"
 objenesis = "3.5"
 axionRelease = "1.21.1"