Upgrade to Grace Async and Events 6.1.0-RC1

Closes gh-689

Author: rainboyan

gradle/libs.versions.toml

@@ -12,8 +12,8 @@ commons-lang3 = "3.12.0"
 glassfish-web-jsp-jstl = "3.0.1"
 gradle = "7.6.4"
 gradle-git-properties = "2.4.2"
-grace-async = "6.1.0-SNAPSHOT"
-grace-events = "6.1.0-SNAPSHOT"
+grace-async = "6.1.0-RC1"
+grace-events = "6.1.0-RC1"
 grails-gdoc = "1.0.1"
 grace-gorm = "2023.1.0-SNAPSHOT"
 grace-gorm-hibernate = "2023.1.0-SNAPSHOT"