Update dependency org.grails:grails-gradle-plugin to v6.1.1 (#801)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle.properties

@@ -1,7 +1,7 @@
 assetPipelineVersion=3.3.4
 gebVersion=2.3
 gormVersion=8.0.3
-grailsGradlePluginVersion=6.1.0
+grailsGradlePluginVersion=6.1.1
 groovyVersion=3.0.11
 h2Version=1.4.200
 hibernate5Version=5.6.15.Final