Update dependency org.grails.plugins:spring-security-core to v5.3.0 (#75)

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

Author: renovate[bot]

gradle.properties

@@ -2,7 +2,7 @@ grailsVersion=5.3.1
 projectVersion=4.0.0-SNAPSHOT
 threeZeroXProjectVersion=3.0.1
 casClientCoreVersion=3.6.4
-springSecurityCoreVersion=5.0.0
+springSecurityCoreVersion=5.3.0
 springSecurityVersion=5.8.8
 javaxServletApiVersion=4.0.1
 assetPipelineVersion=3.4.7