Update dependency org.grails:grails-gradle-plugin to v5.0.0.M3

Author: renovate-bot

gradle.properties

@@ -28,7 +28,7 @@ webdriverBinariesVersion=1.4
 
 # Following are used only for example projects
 fieldsVersion=3.0.0.RC1
-grailsVersion=5.0.0.M2
+grailsVersion=5.0.0.M3
 micrometer.version=1.6.1
 scaffoldingVersion=4.0.0.RC1
 testingSupportVersion=2.2.0.M5