Update dependency org.grails:grails-gorm-testing-support to v2.6.1 (#575)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

gradle.properties

@@ -34,7 +34,7 @@ fieldsVersion=3.0.0.RC1
 grailsVersion=5.1.8
 micrometer.version=1.8.0
 scaffoldingVersion=4.1.0
-testingSupportVersion=2.6.0
+testingSupportVersion=2.6.1
 org.gradle.caching=true
 org.gradle.parallel=false
 org.gradle.daemon=true