Upgrade to Grace Fields Plugin 6.1.0-RC1

Closes gh-694

Author: rainboyan

gradle/grails.versions.toml

@@ -2,7 +2,7 @@
 asset-pipeline = "6.1.0-RC1"
 cache = "6.1.0-RC1"
 database-migration = "6.1.0-M3"
-fields = "6.1.0-M3"
+fields = "6.1.0-RC1"
 geb = "6.1.0-M3"
 hibernate = "2023.1.0-RC1"
 scaffolding = "6.1.0-RC1"