build: add the slf4jPreventExclusion property

Author: matrei

gradle.properties

@@ -16,6 +16,10 @@ picocliVersion=4.7.6
 # For downloading GORM source code for groovydoc generation
 datastoreGithubBranch=9.0.x
 
+# This prevents the Grails Gradle Plugin from unnecessarily excluding slf4j-simple in the generated POMs
+# https://github.com/grails/grails-gradle-plugin/issues/222
+slf4jPreventExclusion=true
+
 org.gradle.caching=true
 org.gradle.parallel=false
 org.gradle.daemon=true