Update dependency grails-testing-support to 2.3.1

Author: puneetbehl

gradle.properties

@@ -34,7 +34,7 @@ fieldsVersion=3.0.0.RC1
 grailsVersion=5.0.3
 micrometer.version=1.8.0
 scaffoldingVersion=4.0.0.RC1
-testingSupportVersion=2.3.0-SNAPSHOT
+testingSupportVersion=2.3.1
 org.gradle.caching=true
 org.gradle.parallel=true
 org.gradle.daemon=true