Upgrade to Grace Geb Plugin 6.1.0-RC1

Closes gh-695

Author: rainboyan

gradle/grails.versions.toml

@@ -3,7 +3,7 @@ asset-pipeline = "6.1.0-RC1"
 cache = "6.1.0-RC1"
 database-migration = "6.1.0-M3"
 fields = "6.1.0-RC1"
-geb = "6.1.0-M3"
+geb = "6.1.0-RC1"
 hibernate = "2023.1.0-RC1"
 scaffolding = "6.1.0-RC1"