Update spring core to v5.3.20 (#1647)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

gradle.properties

@@ -13,7 +13,7 @@ commonsValidatorVersion=1.7
 hibernateVersion=5.6.8.Final
 servletApiVersion=4.0.1
 spockVersion=2.1-groovy-3.0
-springVersion=5.3.19
+springVersion=5.3.20
 caffeineVersion=2.9.3
 grailsVersion=5.1.7
 grailsAsyncVersion=4.0.0