Merge pull request #1546 from grails/renovate/spring-core

Update spring core to v5.3.12

Author: puneetbehl

gradle.properties

@@ -13,7 +13,7 @@ commonsValidatorVersion=1.7
 hibernateVersion=5.5.7.Final
 servletApiVersion=4.0.1
 spockVersion=2.0-groovy-3.0
-springVersion=5.3.10
+springVersion=5.3.12
 caffeineVersion=2.9.2
 grailsVersion=5.0.0
 grailsAsyncVersion=4.0.0