Upgrade to Spring Framework 5.3.12.

Author: jxblum

gradle.properties

@@ -4,7 +4,7 @@ apacheGeodeVersion=1.14.0
 findbugsVersion=3.0.2
 # The Spring Boot & Spring Session version are the only required version properties.
 # The other Spring version properties are for overriding/testing purposes.
-springVersion=5.3.11
+springVersion=5.3.12
 springBootVersion=2.6.0-M3
 springDataBomVersion=2021.1.0-RC1
 springDataCommonsVersion=2.6.0-RC1