Update dependency org.grails.plugins:spring-security-core to v5.2.1 (#144)

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

Author: renovate[bot]

gradle.properties

@@ -11,7 +11,7 @@ assetPipelineVersion=3.3.3
 viewsVersion=2.3.2
 micronautVersion=3.8.3
 servletApiVersion=4.0.1
-springSecurityCoreVersion=5.1.1
+springSecurityCoreVersion=5.2.1
 grailsGradlePluginVersion=5.1.1
 groovyVersion=3.0.9