Update dependency org.spockframework:spock-core to v2.1-groovy-3.0 (#1610)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

gradle.properties

@@ -12,7 +12,7 @@ elVersion=3.0.0
 commonsValidatorVersion=1.7
 hibernateVersion=5.6.5.Final
 servletApiVersion=4.0.1
-spockVersion=2.0-groovy-3.0
+spockVersion=2.1-groovy-3.0
 springVersion=5.3.16
 caffeineVersion=2.9.3
 grailsVersion=5.1.2