[skip ci] Release v8.0.0-RC1

Author: puneetbehl

gradle.properties

@@ -1,7 +1,7 @@
 title=Grails GORM
 projectDesc=GORM - Grails Data Access Framework
 projectUrl=https://gorm.grails.org/
-projectVersion=8.0.0-SNAPSHOT
+projectVersion=8.0.0-RC1
 githubSlug=grails/grails-data-mapping
 developers=Graeme Rocher,Jeff Brown,Burt Beckwith,James Kleeh,Puneet Behl
 hibernateValidatorVersion=6.2.5.Final